Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 Oracle. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public |
| 14 | * License along with this program; if not, write to the |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | * Boston, MA 021110-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/bio.h> |
| 21 | #include <linux/buffer_head.h> |
| 22 | #include <linux/file.h> |
| 23 | #include <linux/fs.h> |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 24 | #include <linux/fsnotify.h> |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 25 | #include <linux/pagemap.h> |
| 26 | #include <linux/highmem.h> |
| 27 | #include <linux/time.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/string.h> |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 30 | #include <linux/backing-dev.h> |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 31 | #include <linux/mount.h> |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 32 | #include <linux/mpage.h> |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 33 | #include <linux/namei.h> |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 34 | #include <linux/swap.h> |
| 35 | #include <linux/writeback.h> |
| 36 | #include <linux/statfs.h> |
| 37 | #include <linux/compat.h> |
| 38 | #include <linux/bit_spinlock.h> |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 39 | #include <linux/security.h> |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 40 | #include <linux/xattr.h> |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 41 | #include <linux/vmalloc.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 42 | #include <linux/slab.h> |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 43 | #include <linux/blkdev.h> |
Chris Mason | 4b4e25f | 2008-11-20 10:22:27 -0500 | [diff] [blame] | 44 | #include "compat.h" |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 45 | #include "ctree.h" |
| 46 | #include "disk-io.h" |
| 47 | #include "transaction.h" |
| 48 | #include "btrfs_inode.h" |
| 49 | #include "ioctl.h" |
| 50 | #include "print-tree.h" |
| 51 | #include "volumes.h" |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 52 | #include "locking.h" |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 53 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 54 | /* Mask out flags that are inappropriate for the given type of inode. */ |
| 55 | static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) |
| 56 | { |
| 57 | if (S_ISDIR(mode)) |
| 58 | return flags; |
| 59 | else if (S_ISREG(mode)) |
| 60 | return flags & ~FS_DIRSYNC_FL; |
| 61 | else |
| 62 | return flags & (FS_NODUMP_FL | FS_NOATIME_FL); |
| 63 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 64 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 65 | /* |
| 66 | * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. |
| 67 | */ |
| 68 | static unsigned int btrfs_flags_to_ioctl(unsigned int flags) |
| 69 | { |
| 70 | unsigned int iflags = 0; |
| 71 | |
| 72 | if (flags & BTRFS_INODE_SYNC) |
| 73 | iflags |= FS_SYNC_FL; |
| 74 | if (flags & BTRFS_INODE_IMMUTABLE) |
| 75 | iflags |= FS_IMMUTABLE_FL; |
| 76 | if (flags & BTRFS_INODE_APPEND) |
| 77 | iflags |= FS_APPEND_FL; |
| 78 | if (flags & BTRFS_INODE_NODUMP) |
| 79 | iflags |= FS_NODUMP_FL; |
| 80 | if (flags & BTRFS_INODE_NOATIME) |
| 81 | iflags |= FS_NOATIME_FL; |
| 82 | if (flags & BTRFS_INODE_DIRSYNC) |
| 83 | iflags |= FS_DIRSYNC_FL; |
Li Zefan | d0092bd | 2011-04-15 03:03:06 +0000 | [diff] [blame] | 84 | if (flags & BTRFS_INODE_NODATACOW) |
| 85 | iflags |= FS_NOCOW_FL; |
| 86 | |
| 87 | if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) |
| 88 | iflags |= FS_COMPR_FL; |
| 89 | else if (flags & BTRFS_INODE_NOCOMPRESS) |
| 90 | iflags |= FS_NOCOMP_FL; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 91 | |
| 92 | return iflags; |
| 93 | } |
| 94 | |
| 95 | /* |
| 96 | * Update inode->i_flags based on the btrfs internal flags. |
| 97 | */ |
| 98 | void btrfs_update_iflags(struct inode *inode) |
| 99 | { |
| 100 | struct btrfs_inode *ip = BTRFS_I(inode); |
| 101 | |
| 102 | inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); |
| 103 | |
| 104 | if (ip->flags & BTRFS_INODE_SYNC) |
| 105 | inode->i_flags |= S_SYNC; |
| 106 | if (ip->flags & BTRFS_INODE_IMMUTABLE) |
| 107 | inode->i_flags |= S_IMMUTABLE; |
| 108 | if (ip->flags & BTRFS_INODE_APPEND) |
| 109 | inode->i_flags |= S_APPEND; |
| 110 | if (ip->flags & BTRFS_INODE_NOATIME) |
| 111 | inode->i_flags |= S_NOATIME; |
| 112 | if (ip->flags & BTRFS_INODE_DIRSYNC) |
| 113 | inode->i_flags |= S_DIRSYNC; |
| 114 | } |
| 115 | |
| 116 | /* |
| 117 | * Inherit flags from the parent inode. |
| 118 | * |
| 119 | * Unlike extN we don't have any flags we don't want to inherit currently. |
| 120 | */ |
| 121 | void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) |
| 122 | { |
Chris Mason | 0b4dcea | 2009-06-11 11:13:35 -0400 | [diff] [blame] | 123 | unsigned int flags; |
| 124 | |
| 125 | if (!dir) |
| 126 | return; |
| 127 | |
| 128 | flags = BTRFS_I(dir)->flags; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 129 | |
| 130 | if (S_ISREG(inode->i_mode)) |
| 131 | flags &= ~BTRFS_INODE_DIRSYNC; |
| 132 | else if (!S_ISDIR(inode->i_mode)) |
| 133 | flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME); |
| 134 | |
| 135 | BTRFS_I(inode)->flags = flags; |
| 136 | btrfs_update_iflags(inode); |
| 137 | } |
| 138 | |
| 139 | static int btrfs_ioctl_getflags(struct file *file, void __user *arg) |
| 140 | { |
| 141 | struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); |
| 142 | unsigned int flags = btrfs_flags_to_ioctl(ip->flags); |
| 143 | |
| 144 | if (copy_to_user(arg, &flags, sizeof(flags))) |
| 145 | return -EFAULT; |
| 146 | return 0; |
| 147 | } |
| 148 | |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 149 | static int check_flags(unsigned int flags) |
| 150 | { |
| 151 | if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ |
| 152 | FS_NOATIME_FL | FS_NODUMP_FL | \ |
| 153 | FS_SYNC_FL | FS_DIRSYNC_FL | \ |
Li Zefan | e1e8fb6 | 2011-04-15 03:02:49 +0000 | [diff] [blame] | 154 | FS_NOCOMP_FL | FS_COMPR_FL | |
| 155 | FS_NOCOW_FL)) |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 156 | return -EOPNOTSUPP; |
| 157 | |
| 158 | if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) |
| 159 | return -EINVAL; |
| 160 | |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 161 | return 0; |
| 162 | } |
| 163 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 164 | static int btrfs_ioctl_setflags(struct file *file, void __user *arg) |
| 165 | { |
| 166 | struct inode *inode = file->f_path.dentry->d_inode; |
| 167 | struct btrfs_inode *ip = BTRFS_I(inode); |
| 168 | struct btrfs_root *root = ip->root; |
| 169 | struct btrfs_trans_handle *trans; |
| 170 | unsigned int flags, oldflags; |
| 171 | int ret; |
| 172 | |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 173 | if (btrfs_root_readonly(root)) |
| 174 | return -EROFS; |
| 175 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 176 | if (copy_from_user(&flags, arg, sizeof(flags))) |
| 177 | return -EFAULT; |
| 178 | |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 179 | ret = check_flags(flags); |
| 180 | if (ret) |
| 181 | return ret; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 182 | |
| 183 | if (!is_owner_or_cap(inode)) |
| 184 | return -EACCES; |
| 185 | |
| 186 | mutex_lock(&inode->i_mutex); |
| 187 | |
| 188 | flags = btrfs_mask_flags(inode->i_mode, flags); |
| 189 | oldflags = btrfs_flags_to_ioctl(ip->flags); |
| 190 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { |
| 191 | if (!capable(CAP_LINUX_IMMUTABLE)) { |
| 192 | ret = -EPERM; |
| 193 | goto out_unlock; |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | ret = mnt_want_write(file->f_path.mnt); |
| 198 | if (ret) |
| 199 | goto out_unlock; |
| 200 | |
| 201 | if (flags & FS_SYNC_FL) |
| 202 | ip->flags |= BTRFS_INODE_SYNC; |
| 203 | else |
| 204 | ip->flags &= ~BTRFS_INODE_SYNC; |
| 205 | if (flags & FS_IMMUTABLE_FL) |
| 206 | ip->flags |= BTRFS_INODE_IMMUTABLE; |
| 207 | else |
| 208 | ip->flags &= ~BTRFS_INODE_IMMUTABLE; |
| 209 | if (flags & FS_APPEND_FL) |
| 210 | ip->flags |= BTRFS_INODE_APPEND; |
| 211 | else |
| 212 | ip->flags &= ~BTRFS_INODE_APPEND; |
| 213 | if (flags & FS_NODUMP_FL) |
| 214 | ip->flags |= BTRFS_INODE_NODUMP; |
| 215 | else |
| 216 | ip->flags &= ~BTRFS_INODE_NODUMP; |
| 217 | if (flags & FS_NOATIME_FL) |
| 218 | ip->flags |= BTRFS_INODE_NOATIME; |
| 219 | else |
| 220 | ip->flags &= ~BTRFS_INODE_NOATIME; |
| 221 | if (flags & FS_DIRSYNC_FL) |
| 222 | ip->flags |= BTRFS_INODE_DIRSYNC; |
| 223 | else |
| 224 | ip->flags &= ~BTRFS_INODE_DIRSYNC; |
Li Zefan | e1e8fb6 | 2011-04-15 03:02:49 +0000 | [diff] [blame] | 225 | if (flags & FS_NOCOW_FL) |
| 226 | ip->flags |= BTRFS_INODE_NODATACOW; |
| 227 | else |
| 228 | ip->flags &= ~BTRFS_INODE_NODATACOW; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 229 | |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 230 | /* |
| 231 | * The COMPRESS flag can only be changed by users, while the NOCOMPRESS |
| 232 | * flag may be changed automatically if compression code won't make |
| 233 | * things smaller. |
| 234 | */ |
| 235 | if (flags & FS_NOCOMP_FL) { |
| 236 | ip->flags &= ~BTRFS_INODE_COMPRESS; |
| 237 | ip->flags |= BTRFS_INODE_NOCOMPRESS; |
| 238 | } else if (flags & FS_COMPR_FL) { |
| 239 | ip->flags |= BTRFS_INODE_COMPRESS; |
| 240 | ip->flags &= ~BTRFS_INODE_NOCOMPRESS; |
Li Zefan | ebcb904 | 2011-04-15 03:03:17 +0000 | [diff] [blame^] | 241 | } else { |
| 242 | ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 243 | } |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 244 | |
| 245 | trans = btrfs_join_transaction(root, 1); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 246 | BUG_ON(IS_ERR(trans)); |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 247 | |
| 248 | ret = btrfs_update_inode(trans, root, inode); |
| 249 | BUG_ON(ret); |
| 250 | |
| 251 | btrfs_update_iflags(inode); |
| 252 | inode->i_ctime = CURRENT_TIME; |
| 253 | btrfs_end_transaction(trans, root); |
| 254 | |
| 255 | mnt_drop_write(file->f_path.mnt); |
liubo | 2d4e6f6a | 2011-02-24 09:38:16 +0000 | [diff] [blame] | 256 | |
| 257 | ret = 0; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 258 | out_unlock: |
| 259 | mutex_unlock(&inode->i_mutex); |
liubo | 2d4e6f6a | 2011-02-24 09:38:16 +0000 | [diff] [blame] | 260 | return ret; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 261 | } |
| 262 | |
| 263 | static int btrfs_ioctl_getversion(struct file *file, int __user *arg) |
| 264 | { |
| 265 | struct inode *inode = file->f_path.dentry->d_inode; |
| 266 | |
| 267 | return put_user(inode->i_generation, arg); |
| 268 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 269 | |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 270 | static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) |
| 271 | { |
| 272 | struct btrfs_root *root = fdentry(file)->d_sb->s_fs_info; |
| 273 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 274 | struct btrfs_device *device; |
| 275 | struct request_queue *q; |
| 276 | struct fstrim_range range; |
| 277 | u64 minlen = ULLONG_MAX; |
| 278 | u64 num_devices = 0; |
| 279 | int ret; |
| 280 | |
| 281 | if (!capable(CAP_SYS_ADMIN)) |
| 282 | return -EPERM; |
| 283 | |
| 284 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
| 285 | list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) { |
| 286 | if (!device->bdev) |
| 287 | continue; |
| 288 | q = bdev_get_queue(device->bdev); |
| 289 | if (blk_queue_discard(q)) { |
| 290 | num_devices++; |
| 291 | minlen = min((u64)q->limits.discard_granularity, |
| 292 | minlen); |
| 293 | } |
| 294 | } |
| 295 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
| 296 | if (!num_devices) |
| 297 | return -EOPNOTSUPP; |
| 298 | |
| 299 | if (copy_from_user(&range, arg, sizeof(range))) |
| 300 | return -EFAULT; |
| 301 | |
| 302 | range.minlen = max(range.minlen, minlen); |
| 303 | ret = btrfs_trim_fs(root, &range); |
| 304 | if (ret < 0) |
| 305 | return ret; |
| 306 | |
| 307 | if (copy_to_user(arg, &range, sizeof(range))) |
| 308 | return -EFAULT; |
| 309 | |
| 310 | return 0; |
| 311 | } |
| 312 | |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 313 | static noinline int create_subvol(struct btrfs_root *root, |
| 314 | struct dentry *dentry, |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 315 | char *name, int namelen, |
| 316 | u64 *async_transid) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 317 | { |
| 318 | struct btrfs_trans_handle *trans; |
| 319 | struct btrfs_key key; |
| 320 | struct btrfs_root_item root_item; |
| 321 | struct btrfs_inode_item *inode_item; |
| 322 | struct extent_buffer *leaf; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 323 | struct btrfs_root *new_root; |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 324 | struct dentry *parent = dget_parent(dentry); |
| 325 | struct inode *dir; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 326 | int ret; |
| 327 | int err; |
| 328 | u64 objectid; |
| 329 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 330 | u64 index = 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 331 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 332 | ret = btrfs_find_free_objectid(NULL, root->fs_info->tree_root, |
| 333 | 0, &objectid); |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 334 | if (ret) { |
| 335 | dput(parent); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 336 | return ret; |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 337 | } |
| 338 | |
| 339 | dir = parent->d_inode; |
| 340 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 341 | /* |
| 342 | * 1 - inode item |
| 343 | * 2 - refs |
| 344 | * 1 - root item |
| 345 | * 2 - dir items |
| 346 | */ |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 347 | trans = btrfs_start_transaction(root, 6); |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 348 | if (IS_ERR(trans)) { |
| 349 | dput(parent); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 350 | return PTR_ERR(trans); |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 351 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 352 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 353 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, |
| 354 | 0, objectid, NULL, 0, 0, 0); |
Josef Bacik | 8e8a1e3 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 355 | if (IS_ERR(leaf)) { |
| 356 | ret = PTR_ERR(leaf); |
| 357 | goto fail; |
| 358 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 359 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 360 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 361 | btrfs_set_header_bytenr(leaf, leaf->start); |
| 362 | btrfs_set_header_generation(leaf, trans->transid); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 363 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 364 | btrfs_set_header_owner(leaf, objectid); |
| 365 | |
| 366 | write_extent_buffer(leaf, root->fs_info->fsid, |
| 367 | (unsigned long)btrfs_header_fsid(leaf), |
| 368 | BTRFS_FSID_SIZE); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 369 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, |
| 370 | (unsigned long)btrfs_header_chunk_tree_uuid(leaf), |
| 371 | BTRFS_UUID_SIZE); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 372 | btrfs_mark_buffer_dirty(leaf); |
| 373 | |
| 374 | inode_item = &root_item.inode; |
| 375 | memset(inode_item, 0, sizeof(*inode_item)); |
| 376 | inode_item->generation = cpu_to_le64(1); |
| 377 | inode_item->size = cpu_to_le64(3); |
| 378 | inode_item->nlink = cpu_to_le32(1); |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 379 | inode_item->nbytes = cpu_to_le64(root->leafsize); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 380 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); |
| 381 | |
Li Zefan | 08fe4db | 2011-03-28 02:01:25 +0000 | [diff] [blame] | 382 | root_item.flags = 0; |
| 383 | root_item.byte_limit = 0; |
| 384 | inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT); |
| 385 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 386 | btrfs_set_root_bytenr(&root_item, leaf->start); |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 387 | btrfs_set_root_generation(&root_item, trans->transid); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 388 | btrfs_set_root_level(&root_item, 0); |
| 389 | btrfs_set_root_refs(&root_item, 1); |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 390 | btrfs_set_root_used(&root_item, leaf->len); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 391 | btrfs_set_root_last_snapshot(&root_item, 0); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 392 | |
| 393 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
| 394 | root_item.drop_level = 0; |
| 395 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 396 | btrfs_tree_unlock(leaf); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 397 | free_extent_buffer(leaf); |
| 398 | leaf = NULL; |
| 399 | |
| 400 | btrfs_set_root_dirid(&root_item, new_dirid); |
| 401 | |
| 402 | key.objectid = objectid; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 403 | key.offset = 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 404 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
| 405 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
| 406 | &root_item); |
| 407 | if (ret) |
| 408 | goto fail; |
| 409 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 410 | key.offset = (u64)-1; |
| 411 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); |
| 412 | BUG_ON(IS_ERR(new_root)); |
| 413 | |
| 414 | btrfs_record_root_in_trans(trans, new_root); |
| 415 | |
| 416 | ret = btrfs_create_subvol_root(trans, new_root, new_dirid, |
| 417 | BTRFS_I(dir)->block_group); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 418 | /* |
| 419 | * insert the directory item |
| 420 | */ |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 421 | ret = btrfs_set_inode_index(dir, &index); |
| 422 | BUG_ON(ret); |
| 423 | |
| 424 | ret = btrfs_insert_dir_item(trans, root, |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 425 | name, namelen, dir->i_ino, &key, |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 426 | BTRFS_FT_DIR, index); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 427 | if (ret) |
| 428 | goto fail; |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 429 | |
Yan Zheng | 52c2617 | 2009-01-05 15:43:43 -0500 | [diff] [blame] | 430 | btrfs_i_size_write(dir, dir->i_size + namelen * 2); |
| 431 | ret = btrfs_update_inode(trans, root, dir); |
| 432 | BUG_ON(ret); |
| 433 | |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 434 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 435 | objectid, root->root_key.objectid, |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 436 | dir->i_ino, index, name, namelen); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 437 | |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 438 | BUG_ON(ret); |
| 439 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 440 | d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 441 | fail: |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 442 | dput(parent); |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 443 | if (async_transid) { |
| 444 | *async_transid = trans->transid; |
| 445 | err = btrfs_commit_transaction_async(trans, root, 1); |
| 446 | } else { |
| 447 | err = btrfs_commit_transaction(trans, root); |
| 448 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 449 | if (err && !ret) |
| 450 | ret = err; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 451 | return ret; |
| 452 | } |
| 453 | |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 454 | static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 455 | char *name, int namelen, u64 *async_transid, |
| 456 | bool readonly) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 457 | { |
Yan, Zheng | 2e4bfab | 2009-11-12 09:37:02 +0000 | [diff] [blame] | 458 | struct inode *inode; |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 459 | struct dentry *parent; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 460 | struct btrfs_pending_snapshot *pending_snapshot; |
| 461 | struct btrfs_trans_handle *trans; |
Yan, Zheng | 2e4bfab | 2009-11-12 09:37:02 +0000 | [diff] [blame] | 462 | int ret; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 463 | |
| 464 | if (!root->ref_cows) |
| 465 | return -EINVAL; |
| 466 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 467 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
| 468 | if (!pending_snapshot) |
| 469 | return -ENOMEM; |
| 470 | |
| 471 | btrfs_init_block_rsv(&pending_snapshot->block_rsv); |
| 472 | pending_snapshot->dentry = dentry; |
| 473 | pending_snapshot->root = root; |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 474 | pending_snapshot->readonly = readonly; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 475 | |
| 476 | trans = btrfs_start_transaction(root->fs_info->extent_root, 5); |
| 477 | if (IS_ERR(trans)) { |
| 478 | ret = PTR_ERR(trans); |
| 479 | goto fail; |
| 480 | } |
| 481 | |
| 482 | ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); |
| 483 | BUG_ON(ret); |
| 484 | |
| 485 | list_add(&pending_snapshot->list, |
| 486 | &trans->transaction->pending_snapshots); |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 487 | if (async_transid) { |
| 488 | *async_transid = trans->transid; |
| 489 | ret = btrfs_commit_transaction_async(trans, |
| 490 | root->fs_info->extent_root, 1); |
| 491 | } else { |
| 492 | ret = btrfs_commit_transaction(trans, |
| 493 | root->fs_info->extent_root); |
| 494 | } |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 495 | BUG_ON(ret); |
| 496 | |
| 497 | ret = pending_snapshot->error; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 498 | if (ret) |
Yan, Zheng | 2e4bfab | 2009-11-12 09:37:02 +0000 | [diff] [blame] | 499 | goto fail; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 500 | |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 501 | ret = btrfs_orphan_cleanup(pending_snapshot->snap); |
| 502 | if (ret) |
| 503 | goto fail; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 504 | |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 505 | parent = dget_parent(dentry); |
| 506 | inode = btrfs_lookup_dentry(parent->d_inode, dentry); |
| 507 | dput(parent); |
Yan, Zheng | 2e4bfab | 2009-11-12 09:37:02 +0000 | [diff] [blame] | 508 | if (IS_ERR(inode)) { |
| 509 | ret = PTR_ERR(inode); |
| 510 | goto fail; |
| 511 | } |
| 512 | BUG_ON(!inode); |
| 513 | d_instantiate(dentry, inode); |
| 514 | ret = 0; |
| 515 | fail: |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 516 | kfree(pending_snapshot); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 517 | return ret; |
| 518 | } |
| 519 | |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 520 | /* copy of check_sticky in fs/namei.c() |
| 521 | * It's inline, so penalty for filesystems that don't use sticky bit is |
| 522 | * minimal. |
| 523 | */ |
| 524 | static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) |
| 525 | { |
| 526 | uid_t fsuid = current_fsuid(); |
| 527 | |
| 528 | if (!(dir->i_mode & S_ISVTX)) |
| 529 | return 0; |
| 530 | if (inode->i_uid == fsuid) |
| 531 | return 0; |
| 532 | if (dir->i_uid == fsuid) |
| 533 | return 0; |
| 534 | return !capable(CAP_FOWNER); |
| 535 | } |
| 536 | |
| 537 | /* copy of may_delete in fs/namei.c() |
| 538 | * Check whether we can remove a link victim from directory dir, check |
| 539 | * whether the type of victim is right. |
| 540 | * 1. We can't do it if dir is read-only (done in permission()) |
| 541 | * 2. We should have write and exec permissions on dir |
| 542 | * 3. We can't remove anything from append-only dir |
| 543 | * 4. We can't do anything with immutable dir (done in permission()) |
| 544 | * 5. If the sticky bit on dir is set we should either |
| 545 | * a. be owner of dir, or |
| 546 | * b. be owner of victim, or |
| 547 | * c. have CAP_FOWNER capability |
| 548 | * 6. If the victim is append-only or immutable we can't do antyhing with |
| 549 | * links pointing to it. |
| 550 | * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. |
| 551 | * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. |
| 552 | * 9. We can't remove a root or mountpoint. |
| 553 | * 10. We don't allow removal of NFS sillyrenamed files; it's handled by |
| 554 | * nfs_async_unlink(). |
| 555 | */ |
| 556 | |
| 557 | static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) |
| 558 | { |
| 559 | int error; |
| 560 | |
| 561 | if (!victim->d_inode) |
| 562 | return -ENOENT; |
| 563 | |
| 564 | BUG_ON(victim->d_parent->d_inode != dir); |
| 565 | audit_inode_child(victim, dir); |
| 566 | |
| 567 | error = inode_permission(dir, MAY_WRITE | MAY_EXEC); |
| 568 | if (error) |
| 569 | return error; |
| 570 | if (IS_APPEND(dir)) |
| 571 | return -EPERM; |
| 572 | if (btrfs_check_sticky(dir, victim->d_inode)|| |
| 573 | IS_APPEND(victim->d_inode)|| |
| 574 | IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) |
| 575 | return -EPERM; |
| 576 | if (isdir) { |
| 577 | if (!S_ISDIR(victim->d_inode->i_mode)) |
| 578 | return -ENOTDIR; |
| 579 | if (IS_ROOT(victim)) |
| 580 | return -EBUSY; |
| 581 | } else if (S_ISDIR(victim->d_inode->i_mode)) |
| 582 | return -EISDIR; |
| 583 | if (IS_DEADDIR(dir)) |
| 584 | return -ENOENT; |
| 585 | if (victim->d_flags & DCACHE_NFSFS_RENAMED) |
| 586 | return -EBUSY; |
| 587 | return 0; |
| 588 | } |
| 589 | |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 590 | /* copy of may_create in fs/namei.c() */ |
| 591 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) |
| 592 | { |
| 593 | if (child->d_inode) |
| 594 | return -EEXIST; |
| 595 | if (IS_DEADDIR(dir)) |
| 596 | return -ENOENT; |
| 597 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); |
| 598 | } |
| 599 | |
| 600 | /* |
| 601 | * Create a new subvolume below @parent. This is largely modeled after |
| 602 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup |
| 603 | * inside this filesystem so it's quite a bit simpler. |
| 604 | */ |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 605 | static noinline int btrfs_mksubvol(struct path *parent, |
| 606 | char *name, int namelen, |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 607 | struct btrfs_root *snap_src, |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 608 | u64 *async_transid, bool readonly) |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 609 | { |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 610 | struct inode *dir = parent->dentry->d_inode; |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 611 | struct dentry *dentry; |
| 612 | int error; |
| 613 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 614 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 615 | |
| 616 | dentry = lookup_one_len(name, parent->dentry, namelen); |
| 617 | error = PTR_ERR(dentry); |
| 618 | if (IS_ERR(dentry)) |
| 619 | goto out_unlock; |
| 620 | |
| 621 | error = -EEXIST; |
| 622 | if (dentry->d_inode) |
| 623 | goto out_dput; |
| 624 | |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 625 | error = mnt_want_write(parent->mnt); |
| 626 | if (error) |
| 627 | goto out_dput; |
| 628 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 629 | error = btrfs_may_create(dir, dentry); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 630 | if (error) |
| 631 | goto out_drop_write; |
| 632 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 633 | down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); |
| 634 | |
| 635 | if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) |
| 636 | goto out_up_read; |
| 637 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 638 | if (snap_src) { |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 639 | error = create_snapshot(snap_src, dentry, |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 640 | name, namelen, async_transid, readonly); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 641 | } else { |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 642 | error = create_subvol(BTRFS_I(dir)->root, dentry, |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 643 | name, namelen, async_transid); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 644 | } |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 645 | if (!error) |
| 646 | fsnotify_mkdir(dir, dentry); |
| 647 | out_up_read: |
| 648 | up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 649 | out_drop_write: |
| 650 | mnt_drop_write(parent->mnt); |
| 651 | out_dput: |
| 652 | dput(dentry); |
| 653 | out_unlock: |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 654 | mutex_unlock(&dir->i_mutex); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 655 | return error; |
| 656 | } |
| 657 | |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 658 | static int should_defrag_range(struct inode *inode, u64 start, u64 len, |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 659 | int thresh, u64 *last_len, u64 *skip, |
| 660 | u64 *defrag_end) |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 661 | { |
| 662 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
| 663 | struct extent_map *em = NULL; |
| 664 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
| 665 | int ret = 1; |
| 666 | |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 667 | |
| 668 | if (thresh == 0) |
| 669 | thresh = 256 * 1024; |
| 670 | |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 671 | /* |
| 672 | * make sure that once we start defragging and extent, we keep on |
| 673 | * defragging it |
| 674 | */ |
| 675 | if (start < *defrag_end) |
| 676 | return 1; |
| 677 | |
| 678 | *skip = 0; |
| 679 | |
| 680 | /* |
| 681 | * hopefully we have this extent in the tree already, try without |
| 682 | * the full extent lock |
| 683 | */ |
| 684 | read_lock(&em_tree->lock); |
| 685 | em = lookup_extent_mapping(em_tree, start, len); |
| 686 | read_unlock(&em_tree->lock); |
| 687 | |
| 688 | if (!em) { |
| 689 | /* get the big lock and read metadata off disk */ |
| 690 | lock_extent(io_tree, start, start + len - 1, GFP_NOFS); |
| 691 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); |
| 692 | unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); |
| 693 | |
Dan Carpenter | 6cf8bfb | 2010-03-20 11:22:10 +0000 | [diff] [blame] | 694 | if (IS_ERR(em)) |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 695 | return 0; |
| 696 | } |
| 697 | |
| 698 | /* this will cover holes, and inline extents */ |
| 699 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) |
| 700 | ret = 0; |
| 701 | |
| 702 | /* |
| 703 | * we hit a real extent, if it is big don't bother defragging it again |
| 704 | */ |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 705 | if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 706 | ret = 0; |
| 707 | |
| 708 | /* |
| 709 | * last_len ends up being a counter of how many bytes we've defragged. |
| 710 | * every time we choose not to defrag an extent, we reset *last_len |
| 711 | * so that the next tiny extent will force a defrag. |
| 712 | * |
| 713 | * The end result of this is that tiny extents before a single big |
| 714 | * extent will force at least part of that big extent to be defragged. |
| 715 | */ |
| 716 | if (ret) { |
| 717 | *last_len += len; |
| 718 | *defrag_end = extent_map_end(em); |
| 719 | } else { |
| 720 | *last_len = 0; |
| 721 | *skip = extent_map_end(em); |
| 722 | *defrag_end = 0; |
| 723 | } |
| 724 | |
| 725 | free_extent_map(em); |
| 726 | return ret; |
| 727 | } |
| 728 | |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 729 | static int btrfs_defrag_file(struct file *file, |
| 730 | struct btrfs_ioctl_defrag_range_args *range) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 731 | { |
| 732 | struct inode *inode = fdentry(file)->d_inode; |
| 733 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 734 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
Chris Mason | 3eaa288 | 2008-07-24 11:57:52 -0400 | [diff] [blame] | 735 | struct btrfs_ordered_extent *ordered; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 736 | struct page *page; |
Li Zefan | 1a419d8 | 2010-10-25 15:12:50 +0800 | [diff] [blame] | 737 | struct btrfs_super_block *disk_super; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 738 | unsigned long last_index; |
| 739 | unsigned long ra_pages = root->fs_info->bdi.ra_pages; |
| 740 | unsigned long total_read = 0; |
Li Zefan | 1a419d8 | 2010-10-25 15:12:50 +0800 | [diff] [blame] | 741 | u64 features; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 742 | u64 page_start; |
| 743 | u64 page_end; |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 744 | u64 last_len = 0; |
| 745 | u64 skip = 0; |
| 746 | u64 defrag_end = 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 747 | unsigned long i; |
| 748 | int ret; |
Li Zefan | 1a419d8 | 2010-10-25 15:12:50 +0800 | [diff] [blame] | 749 | int compress_type = BTRFS_COMPRESS_ZLIB; |
| 750 | |
| 751 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { |
| 752 | if (range->compress_type > BTRFS_COMPRESS_TYPES) |
| 753 | return -EINVAL; |
| 754 | if (range->compress_type) |
| 755 | compress_type = range->compress_type; |
| 756 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 757 | |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 758 | if (inode->i_size == 0) |
| 759 | return 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 760 | |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 761 | if (range->start + range->len > range->start) { |
| 762 | last_index = min_t(u64, inode->i_size - 1, |
| 763 | range->start + range->len - 1) >> PAGE_CACHE_SHIFT; |
| 764 | } else { |
| 765 | last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; |
| 766 | } |
| 767 | |
| 768 | i = range->start >> PAGE_CACHE_SHIFT; |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 769 | while (i <= last_index) { |
| 770 | if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 771 | PAGE_CACHE_SIZE, |
| 772 | range->extent_thresh, |
| 773 | &last_len, &skip, |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 774 | &defrag_end)) { |
| 775 | unsigned long next; |
| 776 | /* |
| 777 | * the should_defrag function tells us how much to skip |
| 778 | * bump our counter by the suggested amount |
| 779 | */ |
| 780 | next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; |
| 781 | i = max(i + 1, next); |
| 782 | continue; |
| 783 | } |
| 784 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 785 | if (total_read % ra_pages == 0) { |
| 786 | btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, |
| 787 | min(last_index, i + ra_pages - 1)); |
| 788 | } |
| 789 | total_read++; |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 790 | mutex_lock(&inode->i_mutex); |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 791 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) |
Li Zefan | 1a419d8 | 2010-10-25 15:12:50 +0800 | [diff] [blame] | 792 | BTRFS_I(inode)->force_compress = compress_type; |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 793 | |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 794 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
| 795 | if (ret) |
| 796 | goto err_unlock; |
Chris Mason | 3eaa288 | 2008-07-24 11:57:52 -0400 | [diff] [blame] | 797 | again: |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 798 | if (inode->i_size == 0 || |
| 799 | i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) { |
| 800 | ret = 0; |
| 801 | goto err_reservations; |
| 802 | } |
| 803 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 804 | page = grab_cache_page(inode->i_mapping, i); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 805 | if (!page) { |
| 806 | ret = -ENOMEM; |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 807 | goto err_reservations; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 808 | } |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 809 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 810 | if (!PageUptodate(page)) { |
| 811 | btrfs_readpage(NULL, page); |
| 812 | lock_page(page); |
| 813 | if (!PageUptodate(page)) { |
| 814 | unlock_page(page); |
| 815 | page_cache_release(page); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 816 | ret = -EIO; |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 817 | goto err_reservations; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 818 | } |
| 819 | } |
| 820 | |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 821 | if (page->mapping != inode->i_mapping) { |
| 822 | unlock_page(page); |
| 823 | page_cache_release(page); |
| 824 | goto again; |
| 825 | } |
| 826 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 827 | wait_on_page_writeback(page); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 828 | |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 829 | if (PageDirty(page)) { |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 830 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 831 | goto loop_unlock; |
| 832 | } |
| 833 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 834 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
| 835 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 836 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
Chris Mason | 3eaa288 | 2008-07-24 11:57:52 -0400 | [diff] [blame] | 837 | |
| 838 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
| 839 | if (ordered) { |
| 840 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
| 841 | unlock_page(page); |
| 842 | page_cache_release(page); |
| 843 | btrfs_start_ordered_extent(inode, ordered, 1); |
| 844 | btrfs_put_ordered_extent(ordered); |
| 845 | goto again; |
| 846 | } |
| 847 | set_page_extent_mapped(page); |
| 848 | |
Chris Mason | f87f057 | 2008-08-01 11:27:23 -0400 | [diff] [blame] | 849 | /* |
| 850 | * this makes sure page_mkwrite is called on the |
| 851 | * page if it is dirtied again later |
| 852 | */ |
| 853 | clear_page_dirty_for_io(page); |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 854 | clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, |
| 855 | page_end, EXTENT_DIRTY | EXTENT_DELALLOC | |
| 856 | EXTENT_DO_ACCOUNTING, GFP_NOFS); |
Chris Mason | f87f057 | 2008-08-01 11:27:23 -0400 | [diff] [blame] | 857 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 858 | btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 859 | ClearPageChecked(page); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 860 | set_page_dirty(page); |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 861 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 862 | |
| 863 | loop_unlock: |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 864 | unlock_page(page); |
| 865 | page_cache_release(page); |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 866 | mutex_unlock(&inode->i_mutex); |
| 867 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 868 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 869 | i++; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 870 | } |
| 871 | |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 872 | if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) |
| 873 | filemap_flush(inode->i_mapping); |
| 874 | |
| 875 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { |
| 876 | /* the filemap_flush will queue IO into the worker threads, but |
| 877 | * we have to make sure the IO is actually started and that |
| 878 | * ordered extents get created before we return |
| 879 | */ |
| 880 | atomic_inc(&root->fs_info->async_submit_draining); |
| 881 | while (atomic_read(&root->fs_info->nr_async_submits) || |
| 882 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
| 883 | wait_event(root->fs_info->async_submit_wait, |
| 884 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && |
| 885 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); |
| 886 | } |
| 887 | atomic_dec(&root->fs_info->async_submit_draining); |
| 888 | |
| 889 | mutex_lock(&inode->i_mutex); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 890 | BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 891 | mutex_unlock(&inode->i_mutex); |
| 892 | } |
| 893 | |
Li Zefan | 1a419d8 | 2010-10-25 15:12:50 +0800 | [diff] [blame] | 894 | disk_super = &root->fs_info->super_copy; |
| 895 | features = btrfs_super_incompat_flags(disk_super); |
| 896 | if (range->compress_type == BTRFS_COMPRESS_LZO) { |
| 897 | features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; |
| 898 | btrfs_set_super_incompat_flags(disk_super, features); |
| 899 | } |
| 900 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 901 | return 0; |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 902 | |
| 903 | err_reservations: |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 904 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
| 905 | err_unlock: |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 906 | mutex_unlock(&inode->i_mutex); |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 907 | return ret; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 908 | } |
| 909 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 910 | static noinline int btrfs_ioctl_resize(struct btrfs_root *root, |
| 911 | void __user *arg) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 912 | { |
| 913 | u64 new_size; |
| 914 | u64 old_size; |
| 915 | u64 devid = 1; |
| 916 | struct btrfs_ioctl_vol_args *vol_args; |
| 917 | struct btrfs_trans_handle *trans; |
| 918 | struct btrfs_device *device = NULL; |
| 919 | char *sizestr; |
| 920 | char *devstr = NULL; |
| 921 | int ret = 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 922 | int mod = 0; |
| 923 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 924 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
| 925 | return -EROFS; |
| 926 | |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 927 | if (!capable(CAP_SYS_ADMIN)) |
| 928 | return -EPERM; |
| 929 | |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 930 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
| 931 | if (IS_ERR(vol_args)) |
| 932 | return PTR_ERR(vol_args); |
Mark Fasheh | 5516e59 | 2008-07-24 12:20:14 -0400 | [diff] [blame] | 933 | |
| 934 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 935 | |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 936 | mutex_lock(&root->fs_info->volume_mutex); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 937 | sizestr = vol_args->name; |
| 938 | devstr = strchr(sizestr, ':'); |
| 939 | if (devstr) { |
| 940 | char *end; |
| 941 | sizestr = devstr + 1; |
| 942 | *devstr = '\0'; |
| 943 | devstr = vol_args->name; |
| 944 | devid = simple_strtoull(devstr, &end, 10); |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 945 | printk(KERN_INFO "resizing devid %llu\n", |
| 946 | (unsigned long long)devid); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 947 | } |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 948 | device = btrfs_find_device(root, devid, NULL, NULL); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 949 | if (!device) { |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 950 | printk(KERN_INFO "resizer unable to find device %llu\n", |
| 951 | (unsigned long long)devid); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 952 | ret = -EINVAL; |
| 953 | goto out_unlock; |
| 954 | } |
| 955 | if (!strcmp(sizestr, "max")) |
| 956 | new_size = device->bdev->bd_inode->i_size; |
| 957 | else { |
| 958 | if (sizestr[0] == '-') { |
| 959 | mod = -1; |
| 960 | sizestr++; |
| 961 | } else if (sizestr[0] == '+') { |
| 962 | mod = 1; |
| 963 | sizestr++; |
| 964 | } |
Akinobu Mita | 9174846 | 2010-02-28 10:59:11 +0000 | [diff] [blame] | 965 | new_size = memparse(sizestr, NULL); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 966 | if (new_size == 0) { |
| 967 | ret = -EINVAL; |
| 968 | goto out_unlock; |
| 969 | } |
| 970 | } |
| 971 | |
| 972 | old_size = device->total_bytes; |
| 973 | |
| 974 | if (mod < 0) { |
| 975 | if (new_size > old_size) { |
| 976 | ret = -EINVAL; |
| 977 | goto out_unlock; |
| 978 | } |
| 979 | new_size = old_size - new_size; |
| 980 | } else if (mod > 0) { |
| 981 | new_size = old_size + new_size; |
| 982 | } |
| 983 | |
| 984 | if (new_size < 256 * 1024 * 1024) { |
| 985 | ret = -EINVAL; |
| 986 | goto out_unlock; |
| 987 | } |
| 988 | if (new_size > device->bdev->bd_inode->i_size) { |
| 989 | ret = -EFBIG; |
| 990 | goto out_unlock; |
| 991 | } |
| 992 | |
| 993 | do_div(new_size, root->sectorsize); |
| 994 | new_size *= root->sectorsize; |
| 995 | |
| 996 | printk(KERN_INFO "new size for %s is %llu\n", |
| 997 | device->name, (unsigned long long)new_size); |
| 998 | |
| 999 | if (new_size > old_size) { |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1000 | trans = btrfs_start_transaction(root, 0); |
Tsutomu Itoh | 98d5dc1 | 2011-01-20 06:19:37 +0000 | [diff] [blame] | 1001 | if (IS_ERR(trans)) { |
| 1002 | ret = PTR_ERR(trans); |
| 1003 | goto out_unlock; |
| 1004 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1005 | ret = btrfs_grow_device(trans, device, new_size); |
| 1006 | btrfs_commit_transaction(trans, root); |
| 1007 | } else { |
| 1008 | ret = btrfs_shrink_device(device, new_size); |
| 1009 | } |
| 1010 | |
| 1011 | out_unlock: |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 1012 | mutex_unlock(&root->fs_info->volume_mutex); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1013 | kfree(vol_args); |
| 1014 | return ret; |
| 1015 | } |
| 1016 | |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1017 | static noinline int btrfs_ioctl_snap_create_transid(struct file *file, |
| 1018 | char *name, |
| 1019 | unsigned long fd, |
| 1020 | int subvol, |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1021 | u64 *transid, |
| 1022 | bool readonly) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1023 | { |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 1024 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1025 | struct file *src_file; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1026 | int namelen; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1027 | int ret = 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1028 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1029 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
| 1030 | return -EROFS; |
| 1031 | |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1032 | namelen = strlen(name); |
| 1033 | if (strchr(name, '/')) { |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1034 | ret = -EINVAL; |
| 1035 | goto out; |
| 1036 | } |
| 1037 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1038 | if (subvol) { |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1039 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1040 | NULL, transid, readonly); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 1041 | } else { |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1042 | struct inode *src_inode; |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1043 | src_file = fget(fd); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1044 | if (!src_file) { |
| 1045 | ret = -EINVAL; |
| 1046 | goto out; |
| 1047 | } |
| 1048 | |
| 1049 | src_inode = src_file->f_path.dentry->d_inode; |
| 1050 | if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1051 | printk(KERN_INFO "btrfs: Snapshot src from " |
| 1052 | "another FS\n"); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1053 | ret = -EINVAL; |
| 1054 | fput(src_file); |
| 1055 | goto out; |
| 1056 | } |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1057 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
| 1058 | BTRFS_I(src_inode)->root, |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1059 | transid, readonly); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1060 | fput(src_file); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 1061 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1062 | out: |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1063 | return ret; |
| 1064 | } |
| 1065 | |
| 1066 | static noinline int btrfs_ioctl_snap_create(struct file *file, |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1067 | void __user *arg, int subvol) |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1068 | { |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1069 | struct btrfs_ioctl_vol_args *vol_args; |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1070 | int ret; |
| 1071 | |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1072 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
| 1073 | if (IS_ERR(vol_args)) |
| 1074 | return PTR_ERR(vol_args); |
| 1075 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1076 | |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1077 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1078 | vol_args->fd, subvol, |
| 1079 | NULL, false); |
Li Zefan | fdfb1e4 | 2010-12-10 06:41:56 +0000 | [diff] [blame] | 1080 | |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1081 | kfree(vol_args); |
| 1082 | return ret; |
| 1083 | } |
Li Zefan | fdfb1e4 | 2010-12-10 06:41:56 +0000 | [diff] [blame] | 1084 | |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1085 | static noinline int btrfs_ioctl_snap_create_v2(struct file *file, |
| 1086 | void __user *arg, int subvol) |
| 1087 | { |
| 1088 | struct btrfs_ioctl_vol_args_v2 *vol_args; |
| 1089 | int ret; |
| 1090 | u64 transid = 0; |
| 1091 | u64 *ptr = NULL; |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1092 | bool readonly = false; |
Li Zefan | fdfb1e4 | 2010-12-10 06:41:56 +0000 | [diff] [blame] | 1093 | |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1094 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
| 1095 | if (IS_ERR(vol_args)) |
| 1096 | return PTR_ERR(vol_args); |
| 1097 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; |
Sage Weil | 75eaa0e | 2010-12-10 00:36:28 +0000 | [diff] [blame] | 1098 | |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1099 | if (vol_args->flags & |
| 1100 | ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY)) { |
| 1101 | ret = -EOPNOTSUPP; |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1102 | goto out; |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1103 | } |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1104 | |
| 1105 | if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) |
| 1106 | ptr = &transid; |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1107 | if (vol_args->flags & BTRFS_SUBVOL_RDONLY) |
| 1108 | readonly = true; |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1109 | |
| 1110 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1111 | vol_args->fd, subvol, |
| 1112 | ptr, readonly); |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1113 | |
| 1114 | if (ret == 0 && ptr && |
| 1115 | copy_to_user(arg + |
| 1116 | offsetof(struct btrfs_ioctl_vol_args_v2, |
| 1117 | transid), ptr, sizeof(*ptr))) |
| 1118 | ret = -EFAULT; |
Li Zefan | fdfb1e4 | 2010-12-10 06:41:56 +0000 | [diff] [blame] | 1119 | out: |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1120 | kfree(vol_args); |
| 1121 | return ret; |
| 1122 | } |
| 1123 | |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1124 | static noinline int btrfs_ioctl_subvol_getflags(struct file *file, |
| 1125 | void __user *arg) |
| 1126 | { |
| 1127 | struct inode *inode = fdentry(file)->d_inode; |
| 1128 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1129 | int ret = 0; |
| 1130 | u64 flags = 0; |
| 1131 | |
| 1132 | if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) |
| 1133 | return -EINVAL; |
| 1134 | |
| 1135 | down_read(&root->fs_info->subvol_sem); |
| 1136 | if (btrfs_root_readonly(root)) |
| 1137 | flags |= BTRFS_SUBVOL_RDONLY; |
| 1138 | up_read(&root->fs_info->subvol_sem); |
| 1139 | |
| 1140 | if (copy_to_user(arg, &flags, sizeof(flags))) |
| 1141 | ret = -EFAULT; |
| 1142 | |
| 1143 | return ret; |
| 1144 | } |
| 1145 | |
| 1146 | static noinline int btrfs_ioctl_subvol_setflags(struct file *file, |
| 1147 | void __user *arg) |
| 1148 | { |
| 1149 | struct inode *inode = fdentry(file)->d_inode; |
| 1150 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1151 | struct btrfs_trans_handle *trans; |
| 1152 | u64 root_flags; |
| 1153 | u64 flags; |
| 1154 | int ret = 0; |
| 1155 | |
| 1156 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
| 1157 | return -EROFS; |
| 1158 | |
| 1159 | if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) |
| 1160 | return -EINVAL; |
| 1161 | |
| 1162 | if (copy_from_user(&flags, arg, sizeof(flags))) |
| 1163 | return -EFAULT; |
| 1164 | |
Li Zefan | b4dc2b8 | 2011-02-16 06:06:34 +0000 | [diff] [blame] | 1165 | if (flags & BTRFS_SUBVOL_CREATE_ASYNC) |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1166 | return -EINVAL; |
| 1167 | |
| 1168 | if (flags & ~BTRFS_SUBVOL_RDONLY) |
| 1169 | return -EOPNOTSUPP; |
| 1170 | |
Li Zefan | b4dc2b8 | 2011-02-16 06:06:34 +0000 | [diff] [blame] | 1171 | if (!is_owner_or_cap(inode)) |
| 1172 | return -EACCES; |
| 1173 | |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1174 | down_write(&root->fs_info->subvol_sem); |
| 1175 | |
| 1176 | /* nothing to do */ |
| 1177 | if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) |
| 1178 | goto out; |
| 1179 | |
| 1180 | root_flags = btrfs_root_flags(&root->root_item); |
| 1181 | if (flags & BTRFS_SUBVOL_RDONLY) |
| 1182 | btrfs_set_root_flags(&root->root_item, |
| 1183 | root_flags | BTRFS_ROOT_SUBVOL_RDONLY); |
| 1184 | else |
| 1185 | btrfs_set_root_flags(&root->root_item, |
| 1186 | root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); |
| 1187 | |
| 1188 | trans = btrfs_start_transaction(root, 1); |
| 1189 | if (IS_ERR(trans)) { |
| 1190 | ret = PTR_ERR(trans); |
| 1191 | goto out_reset; |
| 1192 | } |
| 1193 | |
Li Zefan | b4dc2b8 | 2011-02-16 06:06:34 +0000 | [diff] [blame] | 1194 | ret = btrfs_update_root(trans, root->fs_info->tree_root, |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1195 | &root->root_key, &root->root_item); |
| 1196 | |
| 1197 | btrfs_commit_transaction(trans, root); |
| 1198 | out_reset: |
| 1199 | if (ret) |
| 1200 | btrfs_set_root_flags(&root->root_item, root_flags); |
| 1201 | out: |
| 1202 | up_write(&root->fs_info->subvol_sem); |
| 1203 | return ret; |
| 1204 | } |
| 1205 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1206 | /* |
| 1207 | * helper to check if the subvolume references other subvolumes |
| 1208 | */ |
| 1209 | static noinline int may_destroy_subvol(struct btrfs_root *root) |
| 1210 | { |
| 1211 | struct btrfs_path *path; |
| 1212 | struct btrfs_key key; |
| 1213 | int ret; |
| 1214 | |
| 1215 | path = btrfs_alloc_path(); |
| 1216 | if (!path) |
| 1217 | return -ENOMEM; |
| 1218 | |
| 1219 | key.objectid = root->root_key.objectid; |
| 1220 | key.type = BTRFS_ROOT_REF_KEY; |
| 1221 | key.offset = (u64)-1; |
| 1222 | |
| 1223 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, |
| 1224 | &key, path, 0, 0); |
| 1225 | if (ret < 0) |
| 1226 | goto out; |
| 1227 | BUG_ON(ret == 0); |
| 1228 | |
| 1229 | ret = 0; |
| 1230 | if (path->slots[0] > 0) { |
| 1231 | path->slots[0]--; |
| 1232 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); |
| 1233 | if (key.objectid == root->root_key.objectid && |
| 1234 | key.type == BTRFS_ROOT_REF_KEY) |
| 1235 | ret = -ENOTEMPTY; |
| 1236 | } |
| 1237 | out: |
| 1238 | btrfs_free_path(path); |
| 1239 | return ret; |
| 1240 | } |
| 1241 | |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1242 | static noinline int key_in_sk(struct btrfs_key *key, |
| 1243 | struct btrfs_ioctl_search_key *sk) |
| 1244 | { |
Chris Mason | abc6e13 | 2010-03-18 12:10:08 -0400 | [diff] [blame] | 1245 | struct btrfs_key test; |
| 1246 | int ret; |
| 1247 | |
| 1248 | test.objectid = sk->min_objectid; |
| 1249 | test.type = sk->min_type; |
| 1250 | test.offset = sk->min_offset; |
| 1251 | |
| 1252 | ret = btrfs_comp_cpu_keys(key, &test); |
| 1253 | if (ret < 0) |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1254 | return 0; |
Chris Mason | abc6e13 | 2010-03-18 12:10:08 -0400 | [diff] [blame] | 1255 | |
| 1256 | test.objectid = sk->max_objectid; |
| 1257 | test.type = sk->max_type; |
| 1258 | test.offset = sk->max_offset; |
| 1259 | |
| 1260 | ret = btrfs_comp_cpu_keys(key, &test); |
| 1261 | if (ret > 0) |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1262 | return 0; |
| 1263 | return 1; |
| 1264 | } |
| 1265 | |
| 1266 | static noinline int copy_to_sk(struct btrfs_root *root, |
| 1267 | struct btrfs_path *path, |
| 1268 | struct btrfs_key *key, |
| 1269 | struct btrfs_ioctl_search_key *sk, |
| 1270 | char *buf, |
| 1271 | unsigned long *sk_offset, |
| 1272 | int *num_found) |
| 1273 | { |
| 1274 | u64 found_transid; |
| 1275 | struct extent_buffer *leaf; |
| 1276 | struct btrfs_ioctl_search_header sh; |
| 1277 | unsigned long item_off; |
| 1278 | unsigned long item_len; |
| 1279 | int nritems; |
| 1280 | int i; |
| 1281 | int slot; |
| 1282 | int found = 0; |
| 1283 | int ret = 0; |
| 1284 | |
| 1285 | leaf = path->nodes[0]; |
| 1286 | slot = path->slots[0]; |
| 1287 | nritems = btrfs_header_nritems(leaf); |
| 1288 | |
| 1289 | if (btrfs_header_generation(leaf) > sk->max_transid) { |
| 1290 | i = nritems; |
| 1291 | goto advance_key; |
| 1292 | } |
| 1293 | found_transid = btrfs_header_generation(leaf); |
| 1294 | |
| 1295 | for (i = slot; i < nritems; i++) { |
| 1296 | item_off = btrfs_item_ptr_offset(leaf, i); |
| 1297 | item_len = btrfs_item_size_nr(leaf, i); |
| 1298 | |
| 1299 | if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) |
| 1300 | item_len = 0; |
| 1301 | |
| 1302 | if (sizeof(sh) + item_len + *sk_offset > |
| 1303 | BTRFS_SEARCH_ARGS_BUFSIZE) { |
| 1304 | ret = 1; |
| 1305 | goto overflow; |
| 1306 | } |
| 1307 | |
| 1308 | btrfs_item_key_to_cpu(leaf, key, i); |
| 1309 | if (!key_in_sk(key, sk)) |
| 1310 | continue; |
| 1311 | |
| 1312 | sh.objectid = key->objectid; |
| 1313 | sh.offset = key->offset; |
| 1314 | sh.type = key->type; |
| 1315 | sh.len = item_len; |
| 1316 | sh.transid = found_transid; |
| 1317 | |
| 1318 | /* copy search result header */ |
| 1319 | memcpy(buf + *sk_offset, &sh, sizeof(sh)); |
| 1320 | *sk_offset += sizeof(sh); |
| 1321 | |
| 1322 | if (item_len) { |
| 1323 | char *p = buf + *sk_offset; |
| 1324 | /* copy the item */ |
| 1325 | read_extent_buffer(leaf, p, |
| 1326 | item_off, item_len); |
| 1327 | *sk_offset += item_len; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1328 | } |
Chris Mason | 90fdde1 | 2010-03-18 12:14:54 -0400 | [diff] [blame] | 1329 | found++; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1330 | |
| 1331 | if (*num_found >= sk->nr_items) |
| 1332 | break; |
| 1333 | } |
| 1334 | advance_key: |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1335 | ret = 0; |
Chris Mason | abc6e13 | 2010-03-18 12:10:08 -0400 | [diff] [blame] | 1336 | if (key->offset < (u64)-1 && key->offset < sk->max_offset) |
| 1337 | key->offset++; |
| 1338 | else if (key->type < (u8)-1 && key->type < sk->max_type) { |
| 1339 | key->offset = 0; |
| 1340 | key->type++; |
| 1341 | } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { |
| 1342 | key->offset = 0; |
| 1343 | key->type = 0; |
| 1344 | key->objectid++; |
| 1345 | } else |
| 1346 | ret = 1; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1347 | overflow: |
| 1348 | *num_found += found; |
| 1349 | return ret; |
| 1350 | } |
| 1351 | |
| 1352 | static noinline int search_ioctl(struct inode *inode, |
| 1353 | struct btrfs_ioctl_search_args *args) |
| 1354 | { |
| 1355 | struct btrfs_root *root; |
| 1356 | struct btrfs_key key; |
| 1357 | struct btrfs_key max_key; |
| 1358 | struct btrfs_path *path; |
| 1359 | struct btrfs_ioctl_search_key *sk = &args->key; |
| 1360 | struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; |
| 1361 | int ret; |
| 1362 | int num_found = 0; |
| 1363 | unsigned long sk_offset = 0; |
| 1364 | |
| 1365 | path = btrfs_alloc_path(); |
| 1366 | if (!path) |
| 1367 | return -ENOMEM; |
| 1368 | |
| 1369 | if (sk->tree_id == 0) { |
| 1370 | /* search the root of the inode that was passed */ |
| 1371 | root = BTRFS_I(inode)->root; |
| 1372 | } else { |
| 1373 | key.objectid = sk->tree_id; |
| 1374 | key.type = BTRFS_ROOT_ITEM_KEY; |
| 1375 | key.offset = (u64)-1; |
| 1376 | root = btrfs_read_fs_root_no_name(info, &key); |
| 1377 | if (IS_ERR(root)) { |
| 1378 | printk(KERN_ERR "could not find root %llu\n", |
| 1379 | sk->tree_id); |
| 1380 | btrfs_free_path(path); |
| 1381 | return -ENOENT; |
| 1382 | } |
| 1383 | } |
| 1384 | |
| 1385 | key.objectid = sk->min_objectid; |
| 1386 | key.type = sk->min_type; |
| 1387 | key.offset = sk->min_offset; |
| 1388 | |
| 1389 | max_key.objectid = sk->max_objectid; |
| 1390 | max_key.type = sk->max_type; |
| 1391 | max_key.offset = sk->max_offset; |
| 1392 | |
| 1393 | path->keep_locks = 1; |
| 1394 | |
| 1395 | while(1) { |
| 1396 | ret = btrfs_search_forward(root, &key, &max_key, path, 0, |
| 1397 | sk->min_transid); |
| 1398 | if (ret != 0) { |
| 1399 | if (ret > 0) |
| 1400 | ret = 0; |
| 1401 | goto err; |
| 1402 | } |
| 1403 | ret = copy_to_sk(root, path, &key, sk, args->buf, |
| 1404 | &sk_offset, &num_found); |
| 1405 | btrfs_release_path(root, path); |
| 1406 | if (ret || num_found >= sk->nr_items) |
| 1407 | break; |
| 1408 | |
| 1409 | } |
| 1410 | ret = 0; |
| 1411 | err: |
| 1412 | sk->nr_items = num_found; |
| 1413 | btrfs_free_path(path); |
| 1414 | return ret; |
| 1415 | } |
| 1416 | |
| 1417 | static noinline int btrfs_ioctl_tree_search(struct file *file, |
| 1418 | void __user *argp) |
| 1419 | { |
| 1420 | struct btrfs_ioctl_search_args *args; |
| 1421 | struct inode *inode; |
| 1422 | int ret; |
| 1423 | |
| 1424 | if (!capable(CAP_SYS_ADMIN)) |
| 1425 | return -EPERM; |
| 1426 | |
Julia Lawall | 2354d08 | 2010-10-29 15:14:18 -0400 | [diff] [blame] | 1427 | args = memdup_user(argp, sizeof(*args)); |
| 1428 | if (IS_ERR(args)) |
| 1429 | return PTR_ERR(args); |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1430 | |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1431 | inode = fdentry(file)->d_inode; |
| 1432 | ret = search_ioctl(inode, args); |
| 1433 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) |
| 1434 | ret = -EFAULT; |
| 1435 | kfree(args); |
| 1436 | return ret; |
| 1437 | } |
| 1438 | |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 1439 | /* |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1440 | * Search INODE_REFs to identify path name of 'dirid' directory |
| 1441 | * in a 'tree_id' tree. and sets path name to 'name'. |
| 1442 | */ |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 1443 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
| 1444 | u64 tree_id, u64 dirid, char *name) |
| 1445 | { |
| 1446 | struct btrfs_root *root; |
| 1447 | struct btrfs_key key; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1448 | char *ptr; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 1449 | int ret = -1; |
| 1450 | int slot; |
| 1451 | int len; |
| 1452 | int total_len = 0; |
| 1453 | struct btrfs_inode_ref *iref; |
| 1454 | struct extent_buffer *l; |
| 1455 | struct btrfs_path *path; |
| 1456 | |
| 1457 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { |
| 1458 | name[0]='\0'; |
| 1459 | return 0; |
| 1460 | } |
| 1461 | |
| 1462 | path = btrfs_alloc_path(); |
| 1463 | if (!path) |
| 1464 | return -ENOMEM; |
| 1465 | |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1466 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 1467 | |
| 1468 | key.objectid = tree_id; |
| 1469 | key.type = BTRFS_ROOT_ITEM_KEY; |
| 1470 | key.offset = (u64)-1; |
| 1471 | root = btrfs_read_fs_root_no_name(info, &key); |
| 1472 | if (IS_ERR(root)) { |
| 1473 | printk(KERN_ERR "could not find root %llu\n", tree_id); |
Chris Mason | 8ad6fca | 2010-03-18 12:23:10 -0400 | [diff] [blame] | 1474 | ret = -ENOENT; |
| 1475 | goto out; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 1476 | } |
| 1477 | |
| 1478 | key.objectid = dirid; |
| 1479 | key.type = BTRFS_INODE_REF_KEY; |
Chris Mason | 8ad6fca | 2010-03-18 12:23:10 -0400 | [diff] [blame] | 1480 | key.offset = (u64)-1; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 1481 | |
| 1482 | while(1) { |
| 1483 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 1484 | if (ret < 0) |
| 1485 | goto out; |
| 1486 | |
| 1487 | l = path->nodes[0]; |
| 1488 | slot = path->slots[0]; |
Chris Mason | 8ad6fca | 2010-03-18 12:23:10 -0400 | [diff] [blame] | 1489 | if (ret > 0 && slot > 0) |
| 1490 | slot--; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 1491 | btrfs_item_key_to_cpu(l, &key, slot); |
| 1492 | |
| 1493 | if (ret > 0 && (key.objectid != dirid || |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1494 | key.type != BTRFS_INODE_REF_KEY)) { |
| 1495 | ret = -ENOENT; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 1496 | goto out; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1497 | } |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 1498 | |
| 1499 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); |
| 1500 | len = btrfs_inode_ref_name_len(l, iref); |
| 1501 | ptr -= len + 1; |
| 1502 | total_len += len + 1; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1503 | if (ptr < name) |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 1504 | goto out; |
| 1505 | |
| 1506 | *(ptr + len) = '/'; |
| 1507 | read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); |
| 1508 | |
| 1509 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) |
| 1510 | break; |
| 1511 | |
| 1512 | btrfs_release_path(root, path); |
| 1513 | key.objectid = key.offset; |
Chris Mason | 8ad6fca | 2010-03-18 12:23:10 -0400 | [diff] [blame] | 1514 | key.offset = (u64)-1; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 1515 | dirid = key.objectid; |
| 1516 | |
| 1517 | } |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1518 | if (ptr < name) |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 1519 | goto out; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1520 | memcpy(name, ptr, total_len); |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 1521 | name[total_len]='\0'; |
| 1522 | ret = 0; |
| 1523 | out: |
| 1524 | btrfs_free_path(path); |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1525 | return ret; |
| 1526 | } |
| 1527 | |
| 1528 | static noinline int btrfs_ioctl_ino_lookup(struct file *file, |
| 1529 | void __user *argp) |
| 1530 | { |
| 1531 | struct btrfs_ioctl_ino_lookup_args *args; |
| 1532 | struct inode *inode; |
| 1533 | int ret; |
| 1534 | |
| 1535 | if (!capable(CAP_SYS_ADMIN)) |
| 1536 | return -EPERM; |
| 1537 | |
Julia Lawall | 2354d08 | 2010-10-29 15:14:18 -0400 | [diff] [blame] | 1538 | args = memdup_user(argp, sizeof(*args)); |
| 1539 | if (IS_ERR(args)) |
| 1540 | return PTR_ERR(args); |
Dan Carpenter | c2b9692 | 2010-03-20 11:24:15 +0000 | [diff] [blame] | 1541 | |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1542 | inode = fdentry(file)->d_inode; |
| 1543 | |
Chris Mason | 1b53ac4 | 2010-03-18 12:17:05 -0400 | [diff] [blame] | 1544 | if (args->treeid == 0) |
| 1545 | args->treeid = BTRFS_I(inode)->root->root_key.objectid; |
| 1546 | |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1547 | ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, |
| 1548 | args->treeid, args->objectid, |
| 1549 | args->name); |
| 1550 | |
| 1551 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) |
| 1552 | ret = -EFAULT; |
| 1553 | |
| 1554 | kfree(args); |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 1555 | return ret; |
| 1556 | } |
| 1557 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1558 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
| 1559 | void __user *arg) |
| 1560 | { |
| 1561 | struct dentry *parent = fdentry(file); |
| 1562 | struct dentry *dentry; |
| 1563 | struct inode *dir = parent->d_inode; |
| 1564 | struct inode *inode; |
| 1565 | struct btrfs_root *root = BTRFS_I(dir)->root; |
| 1566 | struct btrfs_root *dest = NULL; |
| 1567 | struct btrfs_ioctl_vol_args *vol_args; |
| 1568 | struct btrfs_trans_handle *trans; |
| 1569 | int namelen; |
| 1570 | int ret; |
| 1571 | int err = 0; |
| 1572 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1573 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
| 1574 | if (IS_ERR(vol_args)) |
| 1575 | return PTR_ERR(vol_args); |
| 1576 | |
| 1577 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
| 1578 | namelen = strlen(vol_args->name); |
| 1579 | if (strchr(vol_args->name, '/') || |
| 1580 | strncmp(vol_args->name, "..", namelen) == 0) { |
| 1581 | err = -EINVAL; |
| 1582 | goto out; |
| 1583 | } |
| 1584 | |
| 1585 | err = mnt_want_write(file->f_path.mnt); |
| 1586 | if (err) |
| 1587 | goto out; |
| 1588 | |
| 1589 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
| 1590 | dentry = lookup_one_len(vol_args->name, parent, namelen); |
| 1591 | if (IS_ERR(dentry)) { |
| 1592 | err = PTR_ERR(dentry); |
| 1593 | goto out_unlock_dir; |
| 1594 | } |
| 1595 | |
| 1596 | if (!dentry->d_inode) { |
| 1597 | err = -ENOENT; |
| 1598 | goto out_dput; |
| 1599 | } |
| 1600 | |
| 1601 | inode = dentry->d_inode; |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 1602 | dest = BTRFS_I(inode)->root; |
| 1603 | if (!capable(CAP_SYS_ADMIN)){ |
| 1604 | /* |
| 1605 | * Regular user. Only allow this with a special mount |
| 1606 | * option, when the user has write+exec access to the |
| 1607 | * subvol root, and when rmdir(2) would have been |
| 1608 | * allowed. |
| 1609 | * |
| 1610 | * Note that this is _not_ check that the subvol is |
| 1611 | * empty or doesn't contain data that we wouldn't |
| 1612 | * otherwise be able to delete. |
| 1613 | * |
| 1614 | * Users who want to delete empty subvols should try |
| 1615 | * rmdir(2). |
| 1616 | */ |
| 1617 | err = -EPERM; |
| 1618 | if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) |
| 1619 | goto out_dput; |
| 1620 | |
| 1621 | /* |
| 1622 | * Do not allow deletion if the parent dir is the same |
| 1623 | * as the dir to be deleted. That means the ioctl |
| 1624 | * must be called on the dentry referencing the root |
| 1625 | * of the subvol, not a random directory contained |
| 1626 | * within it. |
| 1627 | */ |
| 1628 | err = -EINVAL; |
| 1629 | if (root == dest) |
| 1630 | goto out_dput; |
| 1631 | |
| 1632 | err = inode_permission(inode, MAY_WRITE | MAY_EXEC); |
| 1633 | if (err) |
| 1634 | goto out_dput; |
| 1635 | |
| 1636 | /* check if subvolume may be deleted by a non-root user */ |
| 1637 | err = btrfs_may_delete(dir, dentry, 1); |
| 1638 | if (err) |
| 1639 | goto out_dput; |
| 1640 | } |
| 1641 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1642 | if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { |
| 1643 | err = -EINVAL; |
| 1644 | goto out_dput; |
| 1645 | } |
| 1646 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1647 | mutex_lock(&inode->i_mutex); |
| 1648 | err = d_invalidate(dentry); |
| 1649 | if (err) |
| 1650 | goto out_unlock; |
| 1651 | |
| 1652 | down_write(&root->fs_info->subvol_sem); |
| 1653 | |
| 1654 | err = may_destroy_subvol(dest); |
| 1655 | if (err) |
| 1656 | goto out_up_write; |
| 1657 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1658 | trans = btrfs_start_transaction(root, 0); |
| 1659 | if (IS_ERR(trans)) { |
| 1660 | err = PTR_ERR(trans); |
Dan Carpenter | d327099 | 2010-05-29 09:46:47 +0000 | [diff] [blame] | 1661 | goto out_up_write; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1662 | } |
| 1663 | trans->block_rsv = &root->fs_info->global_block_rsv; |
| 1664 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1665 | ret = btrfs_unlink_subvol(trans, root, dir, |
| 1666 | dest->root_key.objectid, |
| 1667 | dentry->d_name.name, |
| 1668 | dentry->d_name.len); |
| 1669 | BUG_ON(ret); |
| 1670 | |
| 1671 | btrfs_record_root_in_trans(trans, dest); |
| 1672 | |
| 1673 | memset(&dest->root_item.drop_progress, 0, |
| 1674 | sizeof(dest->root_item.drop_progress)); |
| 1675 | dest->root_item.drop_level = 0; |
| 1676 | btrfs_set_root_refs(&dest->root_item, 0); |
| 1677 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1678 | if (!xchg(&dest->orphan_item_inserted, 1)) { |
| 1679 | ret = btrfs_insert_orphan_item(trans, |
| 1680 | root->fs_info->tree_root, |
| 1681 | dest->root_key.objectid); |
| 1682 | BUG_ON(ret); |
| 1683 | } |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1684 | |
Sage Weil | 531cb13 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1685 | ret = btrfs_end_transaction(trans, root); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1686 | BUG_ON(ret); |
| 1687 | inode->i_flags |= S_DEAD; |
| 1688 | out_up_write: |
| 1689 | up_write(&root->fs_info->subvol_sem); |
| 1690 | out_unlock: |
| 1691 | mutex_unlock(&inode->i_mutex); |
| 1692 | if (!err) { |
Yan, Zheng | efefb14 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 1693 | shrink_dcache_sb(root->fs_info->sb); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1694 | btrfs_invalidate_inodes(dest); |
| 1695 | d_delete(dentry); |
| 1696 | } |
| 1697 | out_dput: |
| 1698 | dput(dentry); |
| 1699 | out_unlock_dir: |
| 1700 | mutex_unlock(&dir->i_mutex); |
| 1701 | mnt_drop_write(file->f_path.mnt); |
| 1702 | out: |
| 1703 | kfree(vol_args); |
| 1704 | return err; |
| 1705 | } |
| 1706 | |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 1707 | static int btrfs_ioctl_defrag(struct file *file, void __user *argp) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1708 | { |
| 1709 | struct inode *inode = fdentry(file)->d_inode; |
| 1710 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 1711 | struct btrfs_ioctl_defrag_range_args *range; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1712 | int ret; |
| 1713 | |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1714 | if (btrfs_root_readonly(root)) |
| 1715 | return -EROFS; |
| 1716 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1717 | ret = mnt_want_write(file->f_path.mnt); |
| 1718 | if (ret) |
| 1719 | return ret; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1720 | |
| 1721 | switch (inode->i_mode & S_IFMT) { |
| 1722 | case S_IFDIR: |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 1723 | if (!capable(CAP_SYS_ADMIN)) { |
| 1724 | ret = -EPERM; |
| 1725 | goto out; |
| 1726 | } |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1727 | ret = btrfs_defrag_root(root, 0); |
| 1728 | if (ret) |
| 1729 | goto out; |
| 1730 | ret = btrfs_defrag_root(root->fs_info->extent_root, 0); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1731 | break; |
| 1732 | case S_IFREG: |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 1733 | if (!(file->f_mode & FMODE_WRITE)) { |
| 1734 | ret = -EINVAL; |
| 1735 | goto out; |
| 1736 | } |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 1737 | |
| 1738 | range = kzalloc(sizeof(*range), GFP_KERNEL); |
| 1739 | if (!range) { |
| 1740 | ret = -ENOMEM; |
| 1741 | goto out; |
| 1742 | } |
| 1743 | |
| 1744 | if (argp) { |
| 1745 | if (copy_from_user(range, argp, |
| 1746 | sizeof(*range))) { |
| 1747 | ret = -EFAULT; |
| 1748 | kfree(range); |
Dan Carpenter | 683be16 | 2010-03-20 11:24:48 +0000 | [diff] [blame] | 1749 | goto out; |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 1750 | } |
| 1751 | /* compression requires us to start the IO */ |
| 1752 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { |
| 1753 | range->flags |= BTRFS_DEFRAG_RANGE_START_IO; |
| 1754 | range->extent_thresh = (u32)-1; |
| 1755 | } |
| 1756 | } else { |
| 1757 | /* the rest are all set to zero by kzalloc */ |
| 1758 | range->len = (u64)-1; |
| 1759 | } |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1760 | ret = btrfs_defrag_file(file, range); |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 1761 | kfree(range); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1762 | break; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1763 | default: |
| 1764 | ret = -EINVAL; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1765 | } |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 1766 | out: |
Yan Zheng | ab67b7c | 2008-12-19 10:58:39 -0500 | [diff] [blame] | 1767 | mnt_drop_write(file->f_path.mnt); |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 1768 | return ret; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1769 | } |
| 1770 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1771 | static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1772 | { |
| 1773 | struct btrfs_ioctl_vol_args *vol_args; |
| 1774 | int ret; |
| 1775 | |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 1776 | if (!capable(CAP_SYS_ADMIN)) |
| 1777 | return -EPERM; |
| 1778 | |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 1779 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
| 1780 | if (IS_ERR(vol_args)) |
| 1781 | return PTR_ERR(vol_args); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1782 | |
Mark Fasheh | 5516e59 | 2008-07-24 12:20:14 -0400 | [diff] [blame] | 1783 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1784 | ret = btrfs_init_new_device(root, vol_args->name); |
| 1785 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1786 | kfree(vol_args); |
| 1787 | return ret; |
| 1788 | } |
| 1789 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1790 | static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1791 | { |
| 1792 | struct btrfs_ioctl_vol_args *vol_args; |
| 1793 | int ret; |
| 1794 | |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 1795 | if (!capable(CAP_SYS_ADMIN)) |
| 1796 | return -EPERM; |
| 1797 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1798 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
| 1799 | return -EROFS; |
| 1800 | |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 1801 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
| 1802 | if (IS_ERR(vol_args)) |
| 1803 | return PTR_ERR(vol_args); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1804 | |
Mark Fasheh | 5516e59 | 2008-07-24 12:20:14 -0400 | [diff] [blame] | 1805 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1806 | ret = btrfs_rm_device(root, vol_args->name); |
| 1807 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1808 | kfree(vol_args); |
| 1809 | return ret; |
| 1810 | } |
| 1811 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1812 | static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, |
| 1813 | u64 off, u64 olen, u64 destoff) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1814 | { |
| 1815 | struct inode *inode = fdentry(file)->d_inode; |
| 1816 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1817 | struct file *src_file; |
| 1818 | struct inode *src; |
| 1819 | struct btrfs_trans_handle *trans; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1820 | struct btrfs_path *path; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1821 | struct extent_buffer *leaf; |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 1822 | char *buf; |
| 1823 | struct btrfs_key key; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1824 | u32 nritems; |
| 1825 | int slot; |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 1826 | int ret; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 1827 | u64 len = olen; |
| 1828 | u64 bs = root->fs_info->sb->s_blocksize; |
| 1829 | u64 hint_byte; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1830 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 1831 | /* |
| 1832 | * TODO: |
| 1833 | * - split compressed inline extents. annoying: we need to |
| 1834 | * decompress into destination's address_space (the file offset |
| 1835 | * may change, so source mapping won't do), then recompress (or |
| 1836 | * otherwise reinsert) a subrange. |
| 1837 | * - allow ranges within the same file to be cloned (provided |
| 1838 | * they don't overlap)? |
| 1839 | */ |
| 1840 | |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 1841 | /* the destination must be opened for writing */ |
Dan Rosenberg | 2ebc346 | 2010-07-19 16:58:20 -0400 | [diff] [blame] | 1842 | if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 1843 | return -EINVAL; |
| 1844 | |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1845 | if (btrfs_root_readonly(root)) |
| 1846 | return -EROFS; |
| 1847 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1848 | ret = mnt_want_write(file->f_path.mnt); |
| 1849 | if (ret) |
| 1850 | return ret; |
| 1851 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 1852 | src_file = fget(srcfd); |
Yan Zheng | ab67b7c | 2008-12-19 10:58:39 -0500 | [diff] [blame] | 1853 | if (!src_file) { |
| 1854 | ret = -EBADF; |
| 1855 | goto out_drop_write; |
| 1856 | } |
Dan Rosenberg | 5dc6416 | 2010-05-15 11:27:37 -0400 | [diff] [blame] | 1857 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1858 | src = src_file->f_dentry->d_inode; |
| 1859 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 1860 | ret = -EINVAL; |
| 1861 | if (src == inode) |
| 1862 | goto out_fput; |
| 1863 | |
Dan Rosenberg | 5dc6416 | 2010-05-15 11:27:37 -0400 | [diff] [blame] | 1864 | /* the src must be open for reading */ |
| 1865 | if (!(src_file->f_mode & FMODE_READ)) |
| 1866 | goto out_fput; |
| 1867 | |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 1868 | ret = -EISDIR; |
| 1869 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1870 | goto out_fput; |
| 1871 | |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 1872 | ret = -EXDEV; |
| 1873 | if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) |
| 1874 | goto out_fput; |
| 1875 | |
| 1876 | ret = -ENOMEM; |
| 1877 | buf = vmalloc(btrfs_level_size(root, 0)); |
| 1878 | if (!buf) |
| 1879 | goto out_fput; |
| 1880 | |
| 1881 | path = btrfs_alloc_path(); |
| 1882 | if (!path) { |
| 1883 | vfree(buf); |
| 1884 | goto out_fput; |
| 1885 | } |
| 1886 | path->reada = 2; |
| 1887 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1888 | if (inode < src) { |
Sage Weil | fccdae4 | 2010-10-29 15:37:33 -0400 | [diff] [blame] | 1889 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); |
| 1890 | mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1891 | } else { |
Sage Weil | fccdae4 | 2010-10-29 15:37:33 -0400 | [diff] [blame] | 1892 | mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); |
| 1893 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1894 | } |
| 1895 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 1896 | /* determine range to clone */ |
| 1897 | ret = -EINVAL; |
Dan Rosenberg | 2ebc346 | 2010-07-19 16:58:20 -0400 | [diff] [blame] | 1898 | if (off + len > src->i_size || off + len < off) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1899 | goto out_unlock; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 1900 | if (len == 0) |
| 1901 | olen = len = src->i_size - off; |
| 1902 | /* if we extend to eof, continue to block boundary */ |
| 1903 | if (off + len == src->i_size) |
Li Zefan | 2a6b8da | 2010-11-19 01:36:10 +0000 | [diff] [blame] | 1904 | len = ALIGN(src->i_size, bs) - off; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 1905 | |
| 1906 | /* verify the end result is block aligned */ |
Li Zefan | 2a6b8da | 2010-11-19 01:36:10 +0000 | [diff] [blame] | 1907 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || |
| 1908 | !IS_ALIGNED(destoff, bs)) |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 1909 | goto out_unlock; |
| 1910 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1911 | /* do any pending delalloc/csum calc on src, one way or |
| 1912 | another, and lock file content */ |
| 1913 | while (1) { |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1914 | struct btrfs_ordered_extent *ordered; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 1915 | lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
Sage Weil | 9a01919 | 2010-10-29 15:37:33 -0400 | [diff] [blame] | 1916 | ordered = btrfs_lookup_first_ordered_extent(src, off+len); |
| 1917 | if (!ordered && |
| 1918 | !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len, |
| 1919 | EXTENT_DELALLOC, 0, NULL)) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1920 | break; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 1921 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 1922 | if (ordered) |
| 1923 | btrfs_put_ordered_extent(ordered); |
Sage Weil | 9a01919 | 2010-10-29 15:37:33 -0400 | [diff] [blame] | 1924 | btrfs_wait_ordered_range(src, off, len); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1925 | } |
| 1926 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 1927 | /* clone data */ |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1928 | key.objectid = src->i_ino; |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 1929 | key.type = BTRFS_EXTENT_DATA_KEY; |
| 1930 | key.offset = 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1931 | |
| 1932 | while (1) { |
| 1933 | /* |
| 1934 | * note the key will change type as we walk through the |
| 1935 | * tree. |
| 1936 | */ |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1937 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1938 | if (ret < 0) |
| 1939 | goto out; |
| 1940 | |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 1941 | nritems = btrfs_header_nritems(path->nodes[0]); |
| 1942 | if (path->slots[0] >= nritems) { |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1943 | ret = btrfs_next_leaf(root, path); |
| 1944 | if (ret < 0) |
| 1945 | goto out; |
| 1946 | if (ret > 0) |
| 1947 | break; |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 1948 | nritems = btrfs_header_nritems(path->nodes[0]); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1949 | } |
| 1950 | leaf = path->nodes[0]; |
| 1951 | slot = path->slots[0]; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1952 | |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 1953 | btrfs_item_key_to_cpu(leaf, &key, slot); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1954 | if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1955 | key.objectid != src->i_ino) |
| 1956 | break; |
| 1957 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 1958 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
| 1959 | struct btrfs_file_extent_item *extent; |
| 1960 | int type; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1961 | u32 size; |
| 1962 | struct btrfs_key new_key; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 1963 | u64 disko = 0, diskl = 0; |
| 1964 | u64 datao = 0, datal = 0; |
| 1965 | u8 comp; |
Sage Weil | b5384d4 | 2010-06-12 22:31:14 +0000 | [diff] [blame] | 1966 | u64 endoff; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1967 | |
| 1968 | size = btrfs_item_size_nr(leaf, slot); |
| 1969 | read_extent_buffer(leaf, buf, |
| 1970 | btrfs_item_ptr_offset(leaf, slot), |
| 1971 | size); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 1972 | |
| 1973 | extent = btrfs_item_ptr(leaf, slot, |
| 1974 | struct btrfs_file_extent_item); |
| 1975 | comp = btrfs_file_extent_compression(leaf, extent); |
| 1976 | type = btrfs_file_extent_type(leaf, extent); |
Chris Mason | c8a894d | 2009-06-27 21:07:03 -0400 | [diff] [blame] | 1977 | if (type == BTRFS_FILE_EXTENT_REG || |
| 1978 | type == BTRFS_FILE_EXTENT_PREALLOC) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1979 | disko = btrfs_file_extent_disk_bytenr(leaf, |
| 1980 | extent); |
| 1981 | diskl = btrfs_file_extent_disk_num_bytes(leaf, |
| 1982 | extent); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 1983 | datao = btrfs_file_extent_offset(leaf, extent); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1984 | datal = btrfs_file_extent_num_bytes(leaf, |
| 1985 | extent); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 1986 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
| 1987 | /* take upper bound, may be compressed */ |
| 1988 | datal = btrfs_file_extent_ram_bytes(leaf, |
| 1989 | extent); |
| 1990 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1991 | btrfs_release_path(root, path); |
| 1992 | |
Sage Weil | 050006a | 2010-10-29 15:37:33 -0400 | [diff] [blame] | 1993 | if (key.offset + datal <= off || |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 1994 | key.offset >= off+len) |
| 1995 | goto next; |
| 1996 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1997 | memcpy(&new_key, &key, sizeof(new_key)); |
| 1998 | new_key.objectid = inode->i_ino; |
Li Zefan | 4d728ec | 2011-01-26 14:10:43 +0800 | [diff] [blame] | 1999 | if (off <= key.offset) |
| 2000 | new_key.offset = key.offset + destoff - off; |
| 2001 | else |
| 2002 | new_key.offset = destoff; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 2003 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2004 | trans = btrfs_start_transaction(root, 1); |
| 2005 | if (IS_ERR(trans)) { |
| 2006 | ret = PTR_ERR(trans); |
| 2007 | goto out; |
| 2008 | } |
| 2009 | |
Chris Mason | c8a894d | 2009-06-27 21:07:03 -0400 | [diff] [blame] | 2010 | if (type == BTRFS_FILE_EXTENT_REG || |
| 2011 | type == BTRFS_FILE_EXTENT_PREALLOC) { |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2012 | if (off > key.offset) { |
| 2013 | datao += off - key.offset; |
| 2014 | datal -= off - key.offset; |
| 2015 | } |
| 2016 | |
| 2017 | if (key.offset + datal > off + len) |
| 2018 | datal = off + len - key.offset; |
| 2019 | |
| 2020 | ret = btrfs_drop_extents(trans, inode, |
| 2021 | new_key.offset, |
| 2022 | new_key.offset + datal, |
| 2023 | &hint_byte, 1); |
| 2024 | BUG_ON(ret); |
| 2025 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 2026 | ret = btrfs_insert_empty_item(trans, root, path, |
| 2027 | &new_key, size); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2028 | BUG_ON(ret); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 2029 | |
| 2030 | leaf = path->nodes[0]; |
| 2031 | slot = path->slots[0]; |
| 2032 | write_extent_buffer(leaf, buf, |
| 2033 | btrfs_item_ptr_offset(leaf, slot), |
| 2034 | size); |
| 2035 | |
| 2036 | extent = btrfs_item_ptr(leaf, slot, |
| 2037 | struct btrfs_file_extent_item); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 2038 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 2039 | /* disko == 0 means it's a hole */ |
| 2040 | if (!disko) |
| 2041 | datao = 0; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 2042 | |
| 2043 | btrfs_set_file_extent_offset(leaf, extent, |
| 2044 | datao); |
| 2045 | btrfs_set_file_extent_num_bytes(leaf, extent, |
| 2046 | datal); |
| 2047 | if (disko) { |
| 2048 | inode_add_bytes(inode, datal); |
| 2049 | ret = btrfs_inc_extent_ref(trans, root, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2050 | disko, diskl, 0, |
| 2051 | root->root_key.objectid, |
| 2052 | inode->i_ino, |
| 2053 | new_key.offset - datao); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 2054 | BUG_ON(ret); |
| 2055 | } |
| 2056 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
| 2057 | u64 skip = 0; |
| 2058 | u64 trim = 0; |
| 2059 | if (off > key.offset) { |
| 2060 | skip = off - key.offset; |
| 2061 | new_key.offset += skip; |
| 2062 | } |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2063 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 2064 | if (key.offset + datal > off+len) |
| 2065 | trim = key.offset + datal - (off+len); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2066 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 2067 | if (comp && (skip || trim)) { |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 2068 | ret = -EINVAL; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2069 | btrfs_end_transaction(trans, root); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 2070 | goto out; |
| 2071 | } |
| 2072 | size -= skip + trim; |
| 2073 | datal -= skip + trim; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2074 | |
| 2075 | ret = btrfs_drop_extents(trans, inode, |
| 2076 | new_key.offset, |
| 2077 | new_key.offset + datal, |
| 2078 | &hint_byte, 1); |
| 2079 | BUG_ON(ret); |
| 2080 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 2081 | ret = btrfs_insert_empty_item(trans, root, path, |
| 2082 | &new_key, size); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2083 | BUG_ON(ret); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 2084 | |
| 2085 | if (skip) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2086 | u32 start = |
| 2087 | btrfs_file_extent_calc_inline_size(0); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 2088 | memmove(buf+start, buf+start+skip, |
| 2089 | datal); |
| 2090 | } |
| 2091 | |
| 2092 | leaf = path->nodes[0]; |
| 2093 | slot = path->slots[0]; |
| 2094 | write_extent_buffer(leaf, buf, |
| 2095 | btrfs_item_ptr_offset(leaf, slot), |
| 2096 | size); |
| 2097 | inode_add_bytes(inode, datal); |
| 2098 | } |
| 2099 | |
| 2100 | btrfs_mark_buffer_dirty(leaf); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2101 | btrfs_release_path(root, path); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 2102 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2103 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
Sage Weil | b5384d4 | 2010-06-12 22:31:14 +0000 | [diff] [blame] | 2104 | |
| 2105 | /* |
| 2106 | * we round up to the block size at eof when |
| 2107 | * determining which extents to clone above, |
| 2108 | * but shouldn't round up the file size |
| 2109 | */ |
| 2110 | endoff = new_key.offset + datal; |
Li Zefan | 5f3888f | 2010-11-19 01:36:34 +0000 | [diff] [blame] | 2111 | if (endoff > destoff+olen) |
| 2112 | endoff = destoff+olen; |
Sage Weil | b5384d4 | 2010-06-12 22:31:14 +0000 | [diff] [blame] | 2113 | if (endoff > inode->i_size) |
| 2114 | btrfs_i_size_write(inode, endoff); |
| 2115 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2116 | BTRFS_I(inode)->flags = BTRFS_I(src)->flags; |
| 2117 | ret = btrfs_update_inode(trans, root, inode); |
| 2118 | BUG_ON(ret); |
| 2119 | btrfs_end_transaction(trans, root); |
| 2120 | } |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2121 | next: |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2122 | btrfs_release_path(root, path); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2123 | key.offset++; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2124 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2125 | ret = 0; |
| 2126 | out: |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 2127 | btrfs_release_path(root, path); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 2128 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2129 | out_unlock: |
| 2130 | mutex_unlock(&src->i_mutex); |
| 2131 | mutex_unlock(&inode->i_mutex); |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 2132 | vfree(buf); |
| 2133 | btrfs_free_path(path); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2134 | out_fput: |
| 2135 | fput(src_file); |
Yan Zheng | ab67b7c | 2008-12-19 10:58:39 -0500 | [diff] [blame] | 2136 | out_drop_write: |
| 2137 | mnt_drop_write(file->f_path.mnt); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2138 | return ret; |
| 2139 | } |
| 2140 | |
Christoph Hellwig | 7a865e8 | 2008-12-02 09:52:24 -0500 | [diff] [blame] | 2141 | static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 2142 | { |
| 2143 | struct btrfs_ioctl_clone_range_args args; |
| 2144 | |
Christoph Hellwig | 7a865e8 | 2008-12-02 09:52:24 -0500 | [diff] [blame] | 2145 | if (copy_from_user(&args, argp, sizeof(args))) |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 2146 | return -EFAULT; |
| 2147 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, |
| 2148 | args.src_length, args.dest_offset); |
| 2149 | } |
| 2150 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2151 | /* |
| 2152 | * there are many ways the trans_start and trans_end ioctls can lead |
| 2153 | * to deadlocks. They should only be used by applications that |
| 2154 | * basically own the machine, and have a very in depth understanding |
| 2155 | * of all the possible deadlocks and enospc problems. |
| 2156 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 2157 | static long btrfs_ioctl_trans_start(struct file *file) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2158 | { |
| 2159 | struct inode *inode = fdentry(file)->d_inode; |
| 2160 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 2161 | struct btrfs_trans_handle *trans; |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 2162 | int ret; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2163 | |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 2164 | ret = -EPERM; |
Christoph Hellwig | df5b552 | 2008-06-11 21:53:58 -0400 | [diff] [blame] | 2165 | if (!capable(CAP_SYS_ADMIN)) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2166 | goto out; |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 2167 | |
| 2168 | ret = -EINPROGRESS; |
| 2169 | if (file->private_data) |
| 2170 | goto out; |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 2171 | |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 2172 | ret = -EROFS; |
| 2173 | if (btrfs_root_readonly(root)) |
| 2174 | goto out; |
| 2175 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 2176 | ret = mnt_want_write(file->f_path.mnt); |
| 2177 | if (ret) |
| 2178 | goto out; |
| 2179 | |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 2180 | mutex_lock(&root->fs_info->trans_mutex); |
| 2181 | root->fs_info->open_ioctl_trans++; |
| 2182 | mutex_unlock(&root->fs_info->trans_mutex); |
| 2183 | |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 2184 | ret = -ENOMEM; |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 2185 | trans = btrfs_start_ioctl_transaction(root, 0); |
Tsutomu Itoh | abd30bb | 2011-01-24 00:57:10 +0000 | [diff] [blame] | 2186 | if (IS_ERR(trans)) |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 2187 | goto out_drop; |
| 2188 | |
| 2189 | file->private_data = trans; |
| 2190 | return 0; |
| 2191 | |
| 2192 | out_drop: |
| 2193 | mutex_lock(&root->fs_info->trans_mutex); |
| 2194 | root->fs_info->open_ioctl_trans--; |
| 2195 | mutex_unlock(&root->fs_info->trans_mutex); |
| 2196 | mnt_drop_write(file->f_path.mnt); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2197 | out: |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2198 | return ret; |
| 2199 | } |
| 2200 | |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 2201 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
| 2202 | { |
| 2203 | struct inode *inode = fdentry(file)->d_inode; |
| 2204 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 2205 | struct btrfs_root *new_root; |
| 2206 | struct btrfs_dir_item *di; |
| 2207 | struct btrfs_trans_handle *trans; |
| 2208 | struct btrfs_path *path; |
| 2209 | struct btrfs_key location; |
| 2210 | struct btrfs_disk_key disk_key; |
| 2211 | struct btrfs_super_block *disk_super; |
| 2212 | u64 features; |
| 2213 | u64 objectid = 0; |
| 2214 | u64 dir_id; |
| 2215 | |
| 2216 | if (!capable(CAP_SYS_ADMIN)) |
| 2217 | return -EPERM; |
| 2218 | |
| 2219 | if (copy_from_user(&objectid, argp, sizeof(objectid))) |
| 2220 | return -EFAULT; |
| 2221 | |
| 2222 | if (!objectid) |
| 2223 | objectid = root->root_key.objectid; |
| 2224 | |
| 2225 | location.objectid = objectid; |
| 2226 | location.type = BTRFS_ROOT_ITEM_KEY; |
| 2227 | location.offset = (u64)-1; |
| 2228 | |
| 2229 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); |
| 2230 | if (IS_ERR(new_root)) |
| 2231 | return PTR_ERR(new_root); |
| 2232 | |
| 2233 | if (btrfs_root_refs(&new_root->root_item) == 0) |
| 2234 | return -ENOENT; |
| 2235 | |
| 2236 | path = btrfs_alloc_path(); |
| 2237 | if (!path) |
| 2238 | return -ENOMEM; |
| 2239 | path->leave_spinning = 1; |
| 2240 | |
| 2241 | trans = btrfs_start_transaction(root, 1); |
Tsutomu Itoh | 98d5dc1 | 2011-01-20 06:19:37 +0000 | [diff] [blame] | 2242 | if (IS_ERR(trans)) { |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 2243 | btrfs_free_path(path); |
Tsutomu Itoh | 98d5dc1 | 2011-01-20 06:19:37 +0000 | [diff] [blame] | 2244 | return PTR_ERR(trans); |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 2245 | } |
| 2246 | |
| 2247 | dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); |
| 2248 | di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, |
| 2249 | dir_id, "default", 7, 1); |
Dan Carpenter | cf1e99a | 2010-05-29 09:47:24 +0000 | [diff] [blame] | 2250 | if (IS_ERR_OR_NULL(di)) { |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 2251 | btrfs_free_path(path); |
| 2252 | btrfs_end_transaction(trans, root); |
| 2253 | printk(KERN_ERR "Umm, you don't have the default dir item, " |
| 2254 | "this isn't going to work\n"); |
| 2255 | return -ENOENT; |
| 2256 | } |
| 2257 | |
| 2258 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); |
| 2259 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); |
| 2260 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 2261 | btrfs_free_path(path); |
| 2262 | |
| 2263 | disk_super = &root->fs_info->super_copy; |
| 2264 | features = btrfs_super_incompat_flags(disk_super); |
| 2265 | if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { |
| 2266 | features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; |
| 2267 | btrfs_set_super_incompat_flags(disk_super, features); |
| 2268 | } |
| 2269 | btrfs_end_transaction(trans, root); |
| 2270 | |
| 2271 | return 0; |
| 2272 | } |
| 2273 | |
Josef Bacik | bf5fc09 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 2274 | static void get_block_group_info(struct list_head *groups_list, |
| 2275 | struct btrfs_ioctl_space_info *space) |
| 2276 | { |
| 2277 | struct btrfs_block_group_cache *block_group; |
| 2278 | |
| 2279 | space->total_bytes = 0; |
| 2280 | space->used_bytes = 0; |
| 2281 | space->flags = 0; |
| 2282 | list_for_each_entry(block_group, groups_list, list) { |
| 2283 | space->flags = block_group->flags; |
| 2284 | space->total_bytes += block_group->key.offset; |
| 2285 | space->used_bytes += |
| 2286 | btrfs_block_group_used(&block_group->item); |
| 2287 | } |
| 2288 | } |
| 2289 | |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 2290 | long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) |
| 2291 | { |
| 2292 | struct btrfs_ioctl_space_args space_args; |
| 2293 | struct btrfs_ioctl_space_info space; |
| 2294 | struct btrfs_ioctl_space_info *dest; |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 2295 | struct btrfs_ioctl_space_info *dest_orig; |
Daniel J Blueman | 13f2696 | 2011-04-11 15:56:31 +0000 | [diff] [blame] | 2296 | struct btrfs_ioctl_space_info __user *user_dest; |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 2297 | struct btrfs_space_info *info; |
Josef Bacik | bf5fc09 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 2298 | u64 types[] = {BTRFS_BLOCK_GROUP_DATA, |
| 2299 | BTRFS_BLOCK_GROUP_SYSTEM, |
| 2300 | BTRFS_BLOCK_GROUP_METADATA, |
| 2301 | BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; |
| 2302 | int num_types = 4; |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 2303 | int alloc_size; |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 2304 | int ret = 0; |
Dan Rosenberg | 51788b1 | 2011-02-14 16:04:23 -0500 | [diff] [blame] | 2305 | u64 slot_count = 0; |
Josef Bacik | bf5fc09 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 2306 | int i, c; |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 2307 | |
| 2308 | if (copy_from_user(&space_args, |
| 2309 | (struct btrfs_ioctl_space_args __user *)arg, |
| 2310 | sizeof(space_args))) |
| 2311 | return -EFAULT; |
| 2312 | |
Josef Bacik | bf5fc09 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 2313 | for (i = 0; i < num_types; i++) { |
| 2314 | struct btrfs_space_info *tmp; |
| 2315 | |
| 2316 | info = NULL; |
| 2317 | rcu_read_lock(); |
| 2318 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, |
| 2319 | list) { |
| 2320 | if (tmp->flags == types[i]) { |
| 2321 | info = tmp; |
| 2322 | break; |
| 2323 | } |
| 2324 | } |
| 2325 | rcu_read_unlock(); |
| 2326 | |
| 2327 | if (!info) |
| 2328 | continue; |
| 2329 | |
| 2330 | down_read(&info->groups_sem); |
| 2331 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { |
| 2332 | if (!list_empty(&info->block_groups[c])) |
| 2333 | slot_count++; |
| 2334 | } |
| 2335 | up_read(&info->groups_sem); |
| 2336 | } |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 2337 | |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 2338 | /* space_slots == 0 means they are asking for a count */ |
| 2339 | if (space_args.space_slots == 0) { |
| 2340 | space_args.total_spaces = slot_count; |
| 2341 | goto out; |
| 2342 | } |
Josef Bacik | bf5fc09 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 2343 | |
Dan Rosenberg | 51788b1 | 2011-02-14 16:04:23 -0500 | [diff] [blame] | 2344 | slot_count = min_t(u64, space_args.space_slots, slot_count); |
Josef Bacik | bf5fc09 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 2345 | |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 2346 | alloc_size = sizeof(*dest) * slot_count; |
Josef Bacik | bf5fc09 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 2347 | |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 2348 | /* we generally have at most 6 or so space infos, one for each raid |
| 2349 | * level. So, a whole page should be more than enough for everyone |
| 2350 | */ |
| 2351 | if (alloc_size > PAGE_CACHE_SIZE) |
| 2352 | return -ENOMEM; |
| 2353 | |
| 2354 | space_args.total_spaces = 0; |
| 2355 | dest = kmalloc(alloc_size, GFP_NOFS); |
| 2356 | if (!dest) |
| 2357 | return -ENOMEM; |
| 2358 | dest_orig = dest; |
| 2359 | |
| 2360 | /* now we have a buffer to copy into */ |
Josef Bacik | bf5fc09 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 2361 | for (i = 0; i < num_types; i++) { |
| 2362 | struct btrfs_space_info *tmp; |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 2363 | |
Dan Rosenberg | 51788b1 | 2011-02-14 16:04:23 -0500 | [diff] [blame] | 2364 | if (!slot_count) |
| 2365 | break; |
| 2366 | |
Josef Bacik | bf5fc09 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 2367 | info = NULL; |
| 2368 | rcu_read_lock(); |
| 2369 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, |
| 2370 | list) { |
| 2371 | if (tmp->flags == types[i]) { |
| 2372 | info = tmp; |
| 2373 | break; |
| 2374 | } |
| 2375 | } |
| 2376 | rcu_read_unlock(); |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 2377 | |
Josef Bacik | bf5fc09 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 2378 | if (!info) |
| 2379 | continue; |
| 2380 | down_read(&info->groups_sem); |
| 2381 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { |
| 2382 | if (!list_empty(&info->block_groups[c])) { |
| 2383 | get_block_group_info(&info->block_groups[c], |
| 2384 | &space); |
| 2385 | memcpy(dest, &space, sizeof(space)); |
| 2386 | dest++; |
| 2387 | space_args.total_spaces++; |
Dan Rosenberg | 51788b1 | 2011-02-14 16:04:23 -0500 | [diff] [blame] | 2388 | slot_count--; |
Josef Bacik | bf5fc09 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 2389 | } |
Dan Rosenberg | 51788b1 | 2011-02-14 16:04:23 -0500 | [diff] [blame] | 2390 | if (!slot_count) |
| 2391 | break; |
Josef Bacik | bf5fc09 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 2392 | } |
| 2393 | up_read(&info->groups_sem); |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 2394 | } |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 2395 | |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 2396 | user_dest = (struct btrfs_ioctl_space_info *) |
| 2397 | (arg + sizeof(struct btrfs_ioctl_space_args)); |
| 2398 | |
| 2399 | if (copy_to_user(user_dest, dest_orig, alloc_size)) |
| 2400 | ret = -EFAULT; |
| 2401 | |
| 2402 | kfree(dest_orig); |
| 2403 | out: |
| 2404 | if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 2405 | ret = -EFAULT; |
| 2406 | |
| 2407 | return ret; |
| 2408 | } |
| 2409 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2410 | /* |
| 2411 | * there are many ways the trans_start and trans_end ioctls can lead |
| 2412 | * to deadlocks. They should only be used by applications that |
| 2413 | * basically own the machine, and have a very in depth understanding |
| 2414 | * of all the possible deadlocks and enospc problems. |
| 2415 | */ |
| 2416 | long btrfs_ioctl_trans_end(struct file *file) |
| 2417 | { |
| 2418 | struct inode *inode = fdentry(file)->d_inode; |
| 2419 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 2420 | struct btrfs_trans_handle *trans; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2421 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2422 | trans = file->private_data; |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 2423 | if (!trans) |
| 2424 | return -EINVAL; |
Christoph Hellwig | b214107 | 2008-09-05 16:43:31 -0400 | [diff] [blame] | 2425 | file->private_data = NULL; |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 2426 | |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 2427 | btrfs_end_transaction(trans, root); |
| 2428 | |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 2429 | mutex_lock(&root->fs_info->trans_mutex); |
| 2430 | root->fs_info->open_ioctl_trans--; |
| 2431 | mutex_unlock(&root->fs_info->trans_mutex); |
| 2432 | |
Sage Weil | cfc8ea8 | 2008-12-11 16:30:06 -0500 | [diff] [blame] | 2433 | mnt_drop_write(file->f_path.mnt); |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 2434 | return 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2435 | } |
| 2436 | |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 2437 | static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) |
| 2438 | { |
| 2439 | struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; |
| 2440 | struct btrfs_trans_handle *trans; |
| 2441 | u64 transid; |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 2442 | int ret; |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 2443 | |
| 2444 | trans = btrfs_start_transaction(root, 0); |
Tsutomu Itoh | 98d5dc1 | 2011-01-20 06:19:37 +0000 | [diff] [blame] | 2445 | if (IS_ERR(trans)) |
| 2446 | return PTR_ERR(trans); |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 2447 | transid = trans->transid; |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 2448 | ret = btrfs_commit_transaction_async(trans, root, 0); |
Tsutomu Itoh | 8b2b2d3 | 2011-04-04 01:52:13 +0000 | [diff] [blame] | 2449 | if (ret) { |
| 2450 | btrfs_end_transaction(trans, root); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 2451 | return ret; |
Tsutomu Itoh | 8b2b2d3 | 2011-04-04 01:52:13 +0000 | [diff] [blame] | 2452 | } |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 2453 | |
| 2454 | if (argp) |
| 2455 | if (copy_to_user(argp, &transid, sizeof(transid))) |
| 2456 | return -EFAULT; |
| 2457 | return 0; |
| 2458 | } |
| 2459 | |
| 2460 | static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) |
| 2461 | { |
| 2462 | struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; |
| 2463 | u64 transid; |
| 2464 | |
| 2465 | if (argp) { |
| 2466 | if (copy_from_user(&transid, argp, sizeof(transid))) |
| 2467 | return -EFAULT; |
| 2468 | } else { |
| 2469 | transid = 0; /* current trans */ |
| 2470 | } |
| 2471 | return btrfs_wait_for_commit(root, transid); |
| 2472 | } |
| 2473 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2474 | long btrfs_ioctl(struct file *file, unsigned int |
| 2475 | cmd, unsigned long arg) |
| 2476 | { |
| 2477 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
Christoph Hellwig | 4bcabaa | 2008-12-02 06:36:08 -0500 | [diff] [blame] | 2478 | void __user *argp = (void __user *)arg; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2479 | |
| 2480 | switch (cmd) { |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 2481 | case FS_IOC_GETFLAGS: |
| 2482 | return btrfs_ioctl_getflags(file, argp); |
| 2483 | case FS_IOC_SETFLAGS: |
| 2484 | return btrfs_ioctl_setflags(file, argp); |
| 2485 | case FS_IOC_GETVERSION: |
| 2486 | return btrfs_ioctl_getversion(file, argp); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 2487 | case FITRIM: |
| 2488 | return btrfs_ioctl_fitrim(file, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2489 | case BTRFS_IOC_SNAP_CREATE: |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 2490 | return btrfs_ioctl_snap_create(file, argp, 0); |
Li Zefan | fdfb1e4 | 2010-12-10 06:41:56 +0000 | [diff] [blame] | 2491 | case BTRFS_IOC_SNAP_CREATE_V2: |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 2492 | return btrfs_ioctl_snap_create_v2(file, argp, 0); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 2493 | case BTRFS_IOC_SUBVOL_CREATE: |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 2494 | return btrfs_ioctl_snap_create(file, argp, 1); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2495 | case BTRFS_IOC_SNAP_DESTROY: |
| 2496 | return btrfs_ioctl_snap_destroy(file, argp); |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 2497 | case BTRFS_IOC_SUBVOL_GETFLAGS: |
| 2498 | return btrfs_ioctl_subvol_getflags(file, argp); |
| 2499 | case BTRFS_IOC_SUBVOL_SETFLAGS: |
| 2500 | return btrfs_ioctl_subvol_setflags(file, argp); |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 2501 | case BTRFS_IOC_DEFAULT_SUBVOL: |
| 2502 | return btrfs_ioctl_default_subvol(file, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2503 | case BTRFS_IOC_DEFRAG: |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 2504 | return btrfs_ioctl_defrag(file, NULL); |
| 2505 | case BTRFS_IOC_DEFRAG_RANGE: |
| 2506 | return btrfs_ioctl_defrag(file, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2507 | case BTRFS_IOC_RESIZE: |
Christoph Hellwig | 4bcabaa | 2008-12-02 06:36:08 -0500 | [diff] [blame] | 2508 | return btrfs_ioctl_resize(root, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2509 | case BTRFS_IOC_ADD_DEV: |
Christoph Hellwig | 4bcabaa | 2008-12-02 06:36:08 -0500 | [diff] [blame] | 2510 | return btrfs_ioctl_add_dev(root, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2511 | case BTRFS_IOC_RM_DEV: |
Christoph Hellwig | 4bcabaa | 2008-12-02 06:36:08 -0500 | [diff] [blame] | 2512 | return btrfs_ioctl_rm_dev(root, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2513 | case BTRFS_IOC_BALANCE: |
| 2514 | return btrfs_balance(root->fs_info->dev_root); |
| 2515 | case BTRFS_IOC_CLONE: |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 2516 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
| 2517 | case BTRFS_IOC_CLONE_RANGE: |
Christoph Hellwig | 7a865e8 | 2008-12-02 09:52:24 -0500 | [diff] [blame] | 2518 | return btrfs_ioctl_clone_range(file, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2519 | case BTRFS_IOC_TRANS_START: |
| 2520 | return btrfs_ioctl_trans_start(file); |
| 2521 | case BTRFS_IOC_TRANS_END: |
| 2522 | return btrfs_ioctl_trans_end(file); |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2523 | case BTRFS_IOC_TREE_SEARCH: |
| 2524 | return btrfs_ioctl_tree_search(file, argp); |
| 2525 | case BTRFS_IOC_INO_LOOKUP: |
| 2526 | return btrfs_ioctl_ino_lookup(file, argp); |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 2527 | case BTRFS_IOC_SPACE_INFO: |
| 2528 | return btrfs_ioctl_space_info(root, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2529 | case BTRFS_IOC_SYNC: |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2530 | btrfs_sync_fs(file->f_dentry->d_sb, 1); |
| 2531 | return 0; |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 2532 | case BTRFS_IOC_START_SYNC: |
| 2533 | return btrfs_ioctl_start_sync(file, argp); |
| 2534 | case BTRFS_IOC_WAIT_SYNC: |
| 2535 | return btrfs_ioctl_wait_sync(file, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2536 | } |
| 2537 | |
| 2538 | return -ENOTTY; |
| 2539 | } |